Place mats, especially for different holiday themes. Our Guild is making some for the Boutique at our Quilt Show next year....just cute fabric with binding and simple quilting....don't even need to piece the fabrics to be effective. Also small wall hangings with holiday themes.
I did craft shows for years with various products and smaller/low-priced items have always done well. However, there are people out there who will purchase larger things, so you might want to have a few larger items, too. This is also a good way to test the market in your area.
Good luck! And have fun with it!!