I limited myself to six colours, and mixed them up into different combinations. Each 4-inch stitched "composition" was layered with a stiff, heavy-weight stabilizer and a final backing of hand-dyed cotton. The sandwich was bound with a dense satin stitch all around the edge.
The finishing touch was to make a gift box to store the eight coasters. I found the instructions to make an origami box and lid on-line. By starting with a 12" square of heavy paper, I was able to craft a box that was just the right size.
A small but satisfying project! I even made a second set: