The cracker blocks need 2 charm squares of a color. And I just happen to have a small bin with orphan 5" blocks, so last night I dug in there to find some with 2 alike. I came up with 11 sets of charms. The color portion of the block just needs 1 charm cut in half vertically, and 1 charm cut in half diagonally. Very simple! The background needs 2 diagonal halves (can be 4.5"), and 1 rectangle 2.5" x 5".
I hope to pull some background scraps later today and cut those pieces so I can start to sew these additional cracker blocks. There are already 9 completed blocks, so these would bring my total to 20. These make a good leader/ender project too.