I get the "what was I thinking" thing alot, too. I have many fabrics that I love by themselves, but that don't work with anything else in my collection, or everything goes together too perfectly (because I keep choosing the same colors, because I like them so much), resulting in blandness. And how many times has a fabric I love looked awful when chopped into quilting bits (wrong scale, or directionality gets lost, or one color element that blends when the fabric is whole suddenly pops out disconcertingly)? Too many times. (Sigh.)
My sympathies.
Alison
PS I agree with Sue J that a light colored sashing would work well with your blocks. Putting them away and not looking at them for a few weeks might also help - my quilts never look as nice in real life as I expect them to, but sticking them in the closet to mature sometimes helps.