I found photo cubes that I used for my "The Ultimate Pin cushion" at Michael's today. They are just a slight bit smaller than the one I made, but compared to the price at Walmart $6.97 the ones at Michaels were only $3.99!!!!
Reference other thread
http://www.quiltingboard.com/t-41853-1.htm
and the tutorial
http://www.quiltingboard.com/t-41887-1.htm