Arcade sprite generators 03 August 2010
Both of these are quite old now, but always lots of fun. First is NFG's Arcade Font Engine, which allows you to dynamically generate your own text from many popular arcade fonts. Intrepid developers might be interested in downloading the PHP source files, which are kindly provided as an optional download.
Even better, though, are Shmups scene generator's. There's horizontal and vertical types, and another that you can use to create backgrounds for your phone. The graphics are limited to arcade shooters, but there's so many options on this one the possibilities are nearly endless. Don't forget to save your images once you're happy with them.