GREAT JOB!
I'D USE A BRIGHT BUTTERCUP-LIKE YELLOW, NO SASHING, PROBABLY WOULDN'T DO A BORDER EITHER (THAT'S ME THOUGH, (I RARELY PUT A BORDER ON A QUILT - THEY USUALLY LOOK LIKE ATTEMPTS TO QUICKLY ENLARGE A TOP)
I'D BIND IN THE SAME FABRIC USED FOR CIRCLES. Whatever colour you choose.
Caps unintentional - didn't look up til well into message.