No alternate uniforms, just home and away. I like the idea of only alternates for outdoor games, and those being one-off designs, A few things to note ahead of time;
Doing some minor realignment and relocation. Firstly going back to old division names, the Eastern and Western conferences remain, but with 6 divisions total pulling down the Campbell and Wales as division names joining the Adams, Patrick, Norris, and Smythe divisions. Moving to 36 teams to bring back the cities that lost franchises. There are some teams with basically no changes, others with just minor adjustments, throwbacks, or color swapped throwbacks. Really that is a good sign that the NHL already has a lot of good uniforms in place.
Eastern Conference:
Adams Division
Boston Bruins: I’ve always preferred them in brown for some reason. This is mostly the uniform the team started to wear in 2007, but in brown, and with modifications to the stripe designs. Also finishing the outline around the shoulder yoke to go all the way around.
Buffalo Sabers: I’ve always preferred them in navy rather than royal blue. Royal blue and yellow looks too similar to St Louis. I went with something similar to the 2017 design, but got rid of the front numbers, the gray on the navy jersey, and returned to a block number font.
Montreal Canadiens: A classic with no need for changes.
Ottawa Senators: I much prefer the 2007 version of the side profile Senators logo, so switching that to the primary mark, with the stripe O as a secondary. When it comes to their uniforms I don't really think they have had a definitive classic look at any point. And when I think of the Sens I always think of them as a black team from their first several seasons. So tried to come up with good black design that features both red and gold as secondary colors.
Quebec Nordiques: Returning to the look they had before they relocated to Colorado. Only difference being using a lighter shade of blue and darker shade of red.
Toronto Maple Leafs: Another original six team with an outstanding design.
Patrick Division
Hartford Whalers: The is mostly the uniform they wore in 1991, the blue is a bit darker, and on the green jersey the logo has both white and blue elements, instead of just white with the blue outline. Just an iconic logo paired with the underused green and blue combo.
New Jersey Devils: Red and green are a far more unique combo than red and black, so just bringing back the original design they had from the 1980’s.
New York Islanders: The current look, which is mostly a throwback to the original design is great, just putting the secondary NY logo on the breezers.
New York Rangers: Another classic not needing any changes.
Philadelphia Flyers: Essentially the design they wore starting in 2010, with the brighter orange, simply making the stripes running down the shoulders to the sleeves wide enough for the numbers to fully fit in there. Also keeping the nameplate contrasting black on both orange and white jerseys.
Pittsburgh Penguins: The current look as of 2016 nails it.
Wales Division
Atlanta Thrashers: I don't think they ever had a good, iconic look in their short history, and they moved around between navy, light blue, and red, never landing on a clear identity. I kept some of the unique design elements of their inaugural 1999 season, made navy the clear primary color, using light brown (the actual color of a thrasher) as the secondary color, with gold and red in there as accents. I think it makes them relatively unique and recognizable.
Carolina Hurricanes: The stick and flag logo is certainly superior, making that the primary logo and crest on both home and away uniforms. The design in 2017 starts as the basis for the jersey, with some modifications going with contrasting black sleeves.
Florida Panthers: The uniform design is based around their original look from 1993, swapping in the modern version of the leaping panther logo, and emphasizing gold more, to differentiate them from the similarly colored Canadiens. 
Nashville Predators: The Predators' fauxback logo from their Winter Classic is way better than their actual logo. So the uniforms are basically just their existing set, with the new logo. A couple of other tweaks being putting the secondary logo patch on both shoulders rather than just one, and also a navy contrasting nameplate on both yellow and white jerseys.
Tampa Bay Lightning: While their current blue design isn't bad, it is kind of generic and also derivative of the Maple Leafs. Their secondary logo with the team name is much better than the plain lightning bolt. So bringing black back into play into the logo and uniform. Using their original design as the basis for the new version. Also adding a color updated version of their Florida and lighting logo, and emphasizing silver as their secondary color with blue as just an accent.
Washington Capitals: Their alternate winged eagle logo is another example of a great logo relegated to alternate status. Using that logo on a design pretty similar to their original uniform set featuring the stars on the sleeves.
Western Conference
Norris Division
Chicago Blackhawks: It always bothered me that the BLACKhawks were a red team, so I'm just taking their black alternate worn from the mid '90s thru the early 2000's and making that the primary home jersey.
Columbus Blue Jackets: I'm not a fan of their primary logo or current uniforms. However their cannon logo is great. I like having them with navy and columbia as their primary colors, with red as just an accent. Attempted to mimic the actual blue jackets worn in the civil war with the stripes on the sleeves. For the secondary logo a mashup of existing Columbus designs with the old Cleveland Barons logo.
Detroit Red Wings: Classic with no need for changes. 
Minnesota Wild: The uniform is based around the old Minnesota North Stars 1978 design, which they currently wear as an alternate. Changing up the green to be half way between the Wild's dark green and the Stars' original bright green. I'd keep the red out of the uniform, and just bring that back for alternates in special games.
St Louis Blues: Their 2025 redesign hit a lot of good parts bringing back elements from past Blues' classic uniforms, so it is very similar, but no contrasting shoulders on the white, more consistent stripe design, and outlines on the numbers. 
Winnipeg Jets: I tried to do a mashup of the original Jets franchise look and the current look. Making a modified version of their original logo to the primary, and current logo their secondary. As far as the uniform, I've sort of mix elements from various uniforms in the team's history.
Smythe Division
Anaheim Ducks: The original logo is way better than the webbed D, I was glad to see they brought it back color swapped to black and orange. I can't say any of their looks have ever been classic, but the old angle torso stripe design was noteworthy, if not great. Tried to make it a little less outlandish for this design.
Las Vegas Knights: Naming wise I prefer more classic convention, so Las Vegas Knights over Vegas Golden Knights. I think the use of gray as the primary color is unique, and works well with the gold and red trim, but the black is sort of pointless mixed with the gray, so removing that. As far as the uniforms. I think their original gray look works well after you remove the black, then recolor accordingly. I also thought a pointed sleeve color block would match the points of the star and swords in the logo. A metallic gold helmet would be great also.
Los Angeles Kings: I can't say I love purple uniforms, but for the sake of some diversity among all the blue, navy, red, and black teams that dominate sports, I'm good for one or two purple teams in each league. And when using purple, yellow compliments it so well. So going back to the Kings' original look, but with a color updated version of their late 1990's crest design rather than just the crown logo. The white uniforms replacing the yellow from that period.
San Jose Sharks: This is pretty similar to their 2023 design, but keep the yellow/orange color in their as an accent in the stripe pattern. Also keeping the black breezers paired with the teal jersey.
Seattle Kraken: I'm certainly not a fan of the name, but they did a great job with the logo. Likewise their color choice is a little weak, navy with light blue shades is a bit overused now, so moved the colors a bit more green on the scale to have them with various shades of aqua. I do also like how the their sleeve stripes show a darkening of their color palette to symbolize deepening / darkening waters, I kept that concept in as well.
Vancouver Canucks: I’ve never been a fan of the whale logo, but the Johnny Canuck lumberjack logo is one of the best in sports. The uniform design isn't really based around any one look, but keeping with the mostly blue original design, with some green trim. 
Campbell Division
Calgary Flames: Just using the existing Flames design, it is a classic.
Colorado Avalanche: Not really drawing on any particular design from their history here, but the most important part is using the old Rockies logo as the primary mark. I also prefer when they had black as part of their design.
Dallas Stars: This look takes inspiration from their 2017 white uniform stripe design, applying it throughout the uniform. I prefer them in black, with just green trim, to distance themselves from their days in Minnesota. For their primary logo I think their Winter Classic logo, but modified with the original Stars font is perfect. 
Edmonton Oilers: My preference is having orange as their primary, with navy, instead of royal blue. The 2017 design is nearly perfect, just adjusting the white jersey to have orange number and shoulder yoke.
Phoenix Coyotes: I was glad they brought back the kachina logo before their eventual relocation, and I think getting a little wild with the colors and uniform, based around their original design, is a good move. It really stands out and is iconic with the Native America themes. I'd make green their primary color, paired with black and orange, and even a little tan and purple mixed in. 
Utah Mammoth: Like the Kraken, poor choice of name, and the logo and color scheme felt a little generic and too trendy respectively. But their overall uniform design is pretty good, and the name, colors, and logo have all grown on me a bit. Not great, but I don't think I dislike it all as much, it feels like a bunch of stuff I wasn't particularly a fan of, but got packaged together in a tasteful way that makes it work. The one change I would make is going with the pale blue breezers to pair with the black uniform. 
