I did this on a toddler quilt once, used the back of a red grunge to match the red in a novelty print (Thomas the Train) on the front of the quilt. I caught myself a few times trying to put "right sides together", but managed okay on the front. I backed the quilt in the same fabric - TOTALLY planning to have the same red showing as the front of the quilt. I had it completely made, washed and shown to my grandson, and didn't realize I had the grunge side showing on the back until I went to take a picture for my records, lol! Luckily it still looked "okay". Like Reader1 said, it's very hard to remember that the wrong side is the right side! Otherwise, I think it's a great idea if the colors work better. :-)