Sometimes when I get "stuck" on color .. ask at the local quilt shop for assistance. If that is not available I use photos or magazine clippings for color inspiration. I have a large bulletin board over my cutting table where I clip and post color combos of interest to me. I once saw a instructor tell a group always pick a light and dark and a medium in the colors of interest. She went on to say most beginners fill quilts with medium and lack the contrast. Additionally she stressed a variety of scale of prints. I can still hear her voice when I go to pick fabrics.