Hey there Tracy, nope those are frozen juice lids, Thanks to my friend Ania Kyte for that great idea. You can see her work often in The Stringing mag.
I do not think the colors change, but you be the judge, here are a few more beads with writing on them with turquoise stringer that I pull, shoot I don't think I ever have bought a stringer other than clear..and a few other beads to give you a good show of what happens.
Ana, a stringer of solid color will be just that 'solid' it is the watery affect that I needed to achieve..VanGogh always left some of his canvas showing and so I needed some whiteish color to show through the stringer and other colors..
anyways here are more beads. Smiles Kerry