I say keep what you like to make things with, use the ugly stuff to practice quilting motifs perhaps, use it for rags if needed, or donate to charity as is. If you want to make a quilt for charity, check to see their requirements for fabric before spending the time. I believe in giving what you'd like to receive in terms of quality, regardless of the recipient (unless it's a pet). I have learned not to store what drags my spirits down. I want to surround myself with beauty and happy fabric. Don't feel obligated to keep someone else's castOffs!