Love2Quilt - I made the paper pieced kitty that matches your paper pieced puppy in your avatar! :) Lol* Just thought I'd share...
Anyhow - this has already been mentioned, but I have goofed up many o'quilt backs myself! Quilting wrinkles right into the back of the quilt. I tape the back of my quilt down to the floor before layering on the batting and top to baste. I am careful of the backing I use too...some cottons just seem to wrinkle up more than others...especially the very thin ones. :) Good luck!