I use watercolors a few times a year and am currently favoring them over acrylics for their easy cleanup. Here are a few ways I keep my my watercolors organized for easy access and re-ordering.
I splurged a few years ago and ordered a few sets of Prang Glitter and Metallics for some special sparkle in projects. I prefer the metallics, they have a smaller glitter in them and add a gentle sparkly sheen once dry. The glitter, while it looks nice in the container, does not end up very glittery on paper. As my students discovered, most of the glitter ends up in the water cup.