Start small and see what catches the buyer's interest. Maybe some hot pads and pot holders would sell well.
A word about Mug Rugs at craft shows.....most people who are NOT sewers or quilters, don't have a c;ie what mug rugs are. I put a small label on mine saying "What's a Mug Rug? A coaster with attitude". Maybe your display could feature a coffee/tea mug and a biscuit.