My personal feeling is that I would save the small precuts, charms, jelly rolls, for items that will not be washed like wall hangings. For myself, I don't put anything into a quilt for use that hasn't been washed. I've had reds bleed before and it isn't nice. If you are putting so much effort and time into something, it's best to try to minimize any problems that may occur later. I know quilters who swear that color catchers will take care of the problem, so you can see that there are quite differing views on this subject.