I like #1 the most and #4 the least.
Since you seem to be good with photoshop/gimp/photo manipulation, I suggest taking the blocks and copying 3 more of them. Arrange them like they were in the final position to see how the final block looks. I do this sometimes when deciding on fabrics, what looks best when you have 1 small block (or block portion) doesn't always look best once several blocks are laid together.