[QUOTE=bearisgray;6784285]When starting with 10 inch squares - what size do the blocks finish at?[/QUOTE
my blocks ended about 1/8 inch under 12 inches. They probably all should have come out to 12 inches but they were a little off. I ended up trimming mine to 11 and 3/4 being careful that the hourglass triangle in each corner stayed in the right spot for sewing the blocks together. When I sewed them together, the bias really helped to line up the colour changes and the hourglass corner triangles.