I am very new to quilting (less than 6 months). I would like to start learning how to hand quilt. Are there any "rules" that govern what color thread (s) that can be use on a multi colored quilt. Can I use just one color or should I try to match the individual colors in the quilt? Will the various colors that might be used to match the top affect how the backing of the quilt will look? Many thanks for any advice.