Chemistry Quilt Part 3

I got all the blocks assembled!

It's hard to tell the scale here.  It's big.  Not T-shirt quilt big, but between a normal lap quilt and a twin.  The blocks are fifteen inches across (three five-inch squares).

I have a little bit of aqua left and I feel like it needs a narrow border.  I'm not wild about leaving the half-blocks floating in aqua, but I also think it feels a little crowded and off-scale.  I can't do much--a couple of inches--without buying more aqua, which I don't want to do as I have way too much scrap fabric already.

I don't know.  I guess I'll go home and cut a strip tonight to stick up there and see how it looks.