I love this idea ans will start doing it. I will cut 1 1/2" squares, save the selvedge name, and glue to a piece of heavy paper with an acid free glue stick. Then I will put it in a plastic sleeve with a 3 hole edge and into a binder.
I think I will do this by color (red, blue etc) rather than mfgr. name for when I take it with me. That way I will have a few colors in mind for my project and not have to carry the whole thing with me.