I like the idea of a purple, but I don't want an excuse to buy more fabric. ;) I'd rather use what I have. And I'm concerned that purple sashing will be too much against a very deep purple wall. You have no idea how much it took for us to decide to go with a purple wall! We're normally terrified of color on walls, and apparently we went nuts in this room!

I'd go with a deep, rich purple for the sashing, so the purples in the blocks stand out

The borders can be something entirely different (lighter) so that the piece will stand out against the wall. The green is too much green, the white isn't enough contrast. I'd go with something textural for the outside borders that you pull from inside the quilt blocks. Lovely blocks!

I vote with for the white. Your husband may be right, this time. The white does give some separation.

Prefer the green. I don't care for the + look of the white.

purple I like to, but if buying more fabric is not on the list go with the white

When I first looked, I thought purple too.

The green would blend too much for my taste. I guess I would have to choose the white but really I wouldn't choose that either. Even a darker shade of green would be more to my taste than the white but I would definitely rule out the seafoam green.

Tara

I would go with purple, but since it's not in your palette, go for White!

If those are your only two choices, white is it. If you happen to have either a darker green or purple in your stash, that would be my first choice and then use the lighter colors for a boarder around it all. This would then set it off more on the dark purple wall.

Definitely the white!!