This looks interesting. Considering joining in. It would be more of a challenge to have the 10" blocks size. All 12" block patterns can be sized down to the 10" size. Just takes that word "math". I use Mary Ellen Hopkins book where in she assists with the math and has several patterns that help in changing the size of block. I know I did another swap with the 10" blocks and actually enjoyed the resulting pattern. This could be done.