These are done with the EMB machine. The pics will give you ideas as to size or topic. They are quick and fun projects.
https://swpea.com/collections/mugrugs-and-coasters
I use mistake blocks from EMB projects and attach to a block with stippling. You can either use traditional binding or cut the back bigger (approx 1 1/2 to 1 3/4 inch). Fold up in half along the edge of mugrug. Fold to top and stitch down.
In simpler terms, double fold the backing piece and stitch down on front.
Hope that helps!