Check out the REBOL examples on Rosetta code. I'm very fond of the "percent of image difference" one -- it's not large, but shows off some of the nice features

Check out the REBOL examples on Rosetta code. I'm very fond of the "percent of image difference" one -- it's not large, but shows off some of the nice features like image handling and the fantastic REBOL GUI dialect. (Yes, I wrote it...)