Glass Bead Gel
"A clear textural gel made with genuine glass beads, offering a unique reflective quality." We learned how you can paint over the dried glass bead gel, and how you can also paint under it before applying. We saw how awesome the gel looks when applied to a decorative paper. I think it would look great over a window in a winter scene looking outside. It doesn't distort the original image, just softens it. It'd also make some awesome sand.
Here's a fast attempt at some waves and a closeup of the beads. Hopefully you can see the tiny glass beads in the closeup.