I love using flannel as a backing, and lucked out at a thrift store close by. They run 1/2 off sales very often, and $6 for a king size high quality brand new set thrills me.. I have about 15 in my stash, and I am good to go for a while, and I'm not opposed to piece the left over pieces to make more backing.. I finished four scrap quilts for my staff, and used five different colored flannels, and we each have the same colors for backing in our quilts.. I ws able to get burgundy, hunter green, navy, and they looked amazing front, and back..