I have the peices for all 50 cut out for the 12" size. I will probably use the little ones for something else, not include them in the same quilt as the big ones.
I'm seriously thinking of doing some of the first group in 6" and 9". 50 12" blocks is a lot of area - though I was thinking of putting them in a row to hang all along the top of the wall.
While the 4" is kind of fun, I'm only doing the blocks with less pieces, I don't know how it would turn out with those that have over 100 pieces in them.