Here's a little game you probably know, but with a twist towards creativity: every time it loads, you get a new random combination of game pieces. Instead of just playing the game to clear the board, you could build interesting structures like fantasy castles. Make screen captures of pretty combinations, and you can use them to decorate your favorite hobby project (scrapbooks, photo albums, 3D textures, etc)
You can play it online for now: Almost the SameGame
...and I'll be making a downloadable version with more pictures soon.