I have learned to say little about a fabric I don't like. My sister and a friend have used some fabrics I thought would never go together, then voila, a beautiful quilt appears.
Then there is the challenge of taking a fabric someone thinks is ugly and turning it into an awesome quilt. I was once challenged by the leader of a group I once belonged to. I didn't think the fabric was that bad to begin with. She loved the quilt I made. The colors I used with it made the pretty colors in the fabric stand out.