I found these instructions to make photo cubes and gave one to my neice, Colleen, for Christmas and she really seemed to like it a lot. It's fun and easy, but it takes much less time if you make your photo files smaller before uploading them. The cubes have 5 sides, so there is no bottom. You can visit this site:
http://app.tabblo.com/studio/productinfo/cube to get started. Have fun!