Randcom is a project mainly written in OBJECTIVE-C and RUBY, it's free.
Random images from the Flickr Commons, iPhone app with Rails server.
Random images from the Flickr Commons, on your iPhone!
Excerise in Objective-C/iPhone programming
Build app from source and put it on your iPhone, not bothering with the app store.
Run app, shake to grab a random image from the Flickr Commons. Use the settings to tweak the api call.