I think that a 1/2" of black around each block (frames each block) then dark green sashing with red cornerstones. Here is my version of the 4 patch posey. One of my favorites.
[ATTACH=CONFIG]474022[/ATTACH] [ATTACH=CONFIG]474023[/ATTACH]
Here's one designed for my DGD, fabric purchased, one of the next ones to be done. It's bright, too!!! The first pic is the original fabric.
[ATTACH=CONFIG]474025[/ATTACH] [ATTACH=CONFIG]474024[/ATTACH]