Bluebird, like your idea of the different colors.
Way back 30+ yrs ago, when I got my serger, I happened upon a thread supplyer on the internet with thread on sale, ~1/4 the usual price. So I bought 4 spools of a whole lot of colors. Black and white is the only thing I've bought since. Back then I made a lot of clothing. Since it takes 4 spools, "match perfectly" got thrown out the window. It takes 2 dresser drawers to hold it all.