Shelbie makes great points for managing your stash. I try to keep a good amount of neutrals or tone-on-tone fabrics on hand, then I'll take a focus fabric and pull fabrics out from my stash. Someone gave me a great tip- use the little circles or squares on the selvedge of the quilt, there are all the colors you can use in your quilt because they are in the fabric. I find that has served me well.