Very cool, great execution for a wallpaper site. Few suggestions...
1. Filter by color. Allow users to pick a color on a palette, and select all the images with that primary color.
2. Categories. A simple dropdown in the navigation to select nature, architecture, water, abstract, etc.
Lastly, why don't you branch this concept out into other areas? This would be a beautiful showcase for general photography. Allow users to upload their work, 'like' photos, and display the best on the homepage. Mix in profiles, and the ability to comment on images you select, and it would be an interesting site. Somewhat of a behance, pinterest, logopond mix geared towards photographers.
Site was put together on a weekend (runs on KirbyCMS + some custom PHP for likes), so any serious add-ons will likely require a re-build.
I can see both being useful though, now that it has ~120 images. I started out with 25, so I really didn't feel like I needed it at the time.
As for the idea, I definitely agree. In my head, it's the design and lack of compromise that make the concept work, so that'd likely carry across well to a different area. Photographers however have 500px (http://500px.com/popular) which I wouldn't set out to beat with a side project :)
1. Filter by color. Allow users to pick a color on a palette, and select all the images with that primary color.
2. Categories. A simple dropdown in the navigation to select nature, architecture, water, abstract, etc.
Lastly, why don't you branch this concept out into other areas? This would be a beautiful showcase for general photography. Allow users to upload their work, 'like' photos, and display the best on the homepage. Mix in profiles, and the ability to comment on images you select, and it would be an interesting site. Somewhat of a behance, pinterest, logopond mix geared towards photographers.