I have a color wheel (somewhere) in my quilting supplies but I have never used it. I like to audition colors/patterns and go with my instict of what I think plays well together. Example spent 15 minutes laying out fabric bolts on table at LQS. I started with a batik I really liked and then looked for colors to compliment it, had about 6-7 bolts on table and decidede on 2 based on color and also did the pattern look good with original fabric. Was heading to cutting table when a nonbatik fabric caught my eye, laid it next to my fabrics and picked it and rejected one of the batiks. I look for fabrics that play well together my friend Nancy Chong taught me long ago when picking fabrics for Hawaiian quilts to put fabrics together and then walk a few feet away and turn around and look at them (do you love them or just so so) and I find it works for my piecing quilts too.