Here are all 8 blocks done. I can be done with 8 if I arrange like this: (OK, I can't figure out how to rotate, but it would length-wise!)
[ATTACH=CONFIG]545564[/ATTACH]
Or, if I do a different block in the center, I can do a 9-block. I'm missing the light yellow at the corners and edges of the blocks. So I could do a completely different block ... or a completely different colour:
[ATTACH=CONFIG]545565[/ATTACH]
I prefer the 9-block layout, but if someone has some sashing / border ideas for the 4x2 ... feel free to post!
Thanks for looking, and all the wonderful comments, and suggestions to come!