If you want to take artsy, digitally distressed photos using your phone, you could use an app, one that intentionally belabors the process to make the photos feel even artsier, like Hipstamatic. Or you could go ultra artsy, with an IRL filter: David McCourt's Slow Photography box.
The retro-future reflex camera box uses your phone as the film, essentially:
To operate, slide the front face open and insert your mobile phone. Turn the lens to select which lens effect you want. The Slow Photography camera has three lenses; fixed focal length, macro and fisheye. Carefully compose your shot by looking through the viewfinder and push the shutter release to capture your shot.
I'm pretty sure you will not take an artsier photo with your phone than you will with this box! Unless somebody figures out a way to make your phone's camera feel even more analog, like if they cross-bred it with a vinyl record player and it hooked up with a Polaroid camera on the way, or something. [David McCourt via Charlie Sorrel's Box of Fun]