I have seen a book that has projects that are all made in the embroidery hoop and I think it includes coasters. called Piece in the Hoop, sold at Amazon. Most of your lace designs that are in a rectangle shape could be used as bookmarkers.
All of the applique designs can be coasters once you know how to insert the insul-brite between the embroidered layer and the last layer and then finish the outline/satin stitch step.
It isn't difficult; just takes the instruction s and a little practice.