Choosing Vintage Buttons for Handspun Yarn

I have been sorting through my GIANT pile of buttons lately- and haven't even gotten near the pile of just white shell buttons. Sorting everything by color and type so it is easy to find 5 or 6 "almost matching" buttons or all blue buttons, etc.  It is a good thing I have about ten gazillion little plastic bags (that I use for dyes ussually)- makes it easy to sort them, far faster than threading everything on to string to sort them (my usual way).