I put together a pack of wallpapers based on my "Urban Skin" project. I posted this in the iPhone wallpaper category, but I also include sizes for iPad wallpapers. Also, I'm sure you can enjoy them on Nexus, Galaxy, or any other Android device.
The images come in two sizes:
9:16 for iPhone (640x1136)
3:4 for iPad (1536x2048)
These photos were not so popular individually, but hopefully you will find them more interesting as a set.