I'll be honest with you -- I think the squares and rectangles set off with black are one quilt, the flying geese belong in a different quilt. They are both nice, but they aren't doing much to complement each other. I think that your hesitation on how to finish this quilt comes from a recognition of that.
Can you just increase the number of "stained glass" blocks to make up the size you want? I think it's best set off with just a black border -- I'd lose the mustardy yellow border.
The flying geese can make a really lovely quilt or wall hanging, in any number of configurations, but again, I think a black on black or solid black is going to make them shine.
RST