Looking to refresh the look on my iPhone I found Poolga. They describe themselves as people who:

... love our iPhones and we love customizing them. But we hate the standard wallpapers and cheesy nature themes available everywhere. That's why we create our own, and thought it would be nice to share them. So here they are. Enjoy!

The wallpapers reminded me of 80's adverts and kids drawings or something Einstürzende Neubauten could use for a CD cover. For now my choice is this one:

The wallpapers are free to download and use on your phones.