If you decide on a 9 patch, I'd go through and cut them all to 2 1/2 X 2 1/2.. that way they will go together quickly and easily.
Another idea would be to make them into 4 patch blocks and then put a shashing between them as you sew the blocks together.. That would also be better if you squared them up first.
Take a look at the 4 patch block quilts around.. they would all work find I would think!
Good luck..