The only way I could do a scrappy quilt, because I have the same problem as you, I would get a pair of those glasses with red lenses (the red cancels the color, so you are just working with what appears to be shades of red, so you can just grab what you like!) they make for color selection, and wear them to work on the quilt! Here are some not too expensive ones to get you started.
http://www.amazon.com/s?ie=UTF8&page...ense%20glasses