I like the black, but with blocks that size, I'd like the sashing a little wider. Are you talking 1" finished or cut? I'd cut at least 2", maybe 2 1/4 or 2 1/2. Then you can do a thin border of black, a coordinating print border (or one of your greens if you can't find a print) about 5"'and bind it in black. Northcutt has some nice greens in small geometric prints or spatter dots right now (for the border.) Sounds like a quilt I would like.