I used 6"x6" canvas boards as the "frame" since they were on clearance :) and painted the sides yellow. Two of my boards used 1.5" squares of the boxes and one board used 2" squares for a different look. I think I like the 1.5" square look the best. These were fun to make. Since my son is younger, we don't have a lot of cracker/cereal boxes. So I called up my sister to save some good boxes for me so I would have a good variety.