Crush eggshells, use brush and fingers to apply to canvas paper - with acrylic paint and matte medium. This is a test. It would have looked better if the paint color wasn't such a dark teal. Being able to see the eggshell white and beige bits through the paint is more interesting than dark blobs. Also, this mix dulls down a bit after it dries, so lighter paint colors (less dark pigment) would improve this situation as well.
