I would use a backing (no Batting) of somethng in the color of light blue and pink. the backing would be a light flannel because it is cool in the air conditioned home in Florida. I made my grand daughter one that way when they lived in Florida and she is 13 now and still loves her summer time quilt. I also did the same thing for my grandson and they lived in Venezula at that time and he is 10 now and he brought his summer time quilt on his last trip to Ohio from Texas where they are now, it gets cold when traveling long distance in the car with the air conditioner. Without the batting it is light weight and cozy to snuggle in. I like the feel of minky fabric. I would quilt in the ditch around each square and if that wasn't enough quilting I would trace hearts or duck or something like that in the blocks if needed. trace them onto the block and follow the traced lines to quilt them.This is just a suggestion.