I had colors missing from my stash (mostly pink). I decided that i should add some of them to my stash to "round it out." What I discovered is that I don't use these hole fixers. So I have a bunch of fabrics now that I will likely donate someday in the not too distant future. I'd rather donate them as quilts, but I don't see myself ever finding a place for them.
So learn from me. If you think the "holes" in your stash need to be fixed, think twice about the reason the holes exist at all.