Sony PSP Player has made a small Pong game with a customiseable background. The ball avoids black pixels and can’t go over them. You can make your own bg.png and draw some black lines onto it to make a custom map. There is an english and a german EBOOT.PBP in the 7zip. The game runs on the 3xx Kernel and on the Slim PSP.

http://forums.qj.net/f-psp-development-forum-11/t-release-pong-with-colour-mapping-126433.html