Be careful about cutting blocks down to a common size. I had a similar set of blocks made by my guild members. When I squared them all up, it cut off the points on some of the blocks and that spoiled blocks that would have been perfect at 1/2" larger. Better to add some sashing in different widths to get the blocks all to the same size than to cut them all down. There is nothing that says it have to be absolutely symmetrical :-)