John covered a lot with what he said. Definitely a dark, solid-colored table cloth. I bought a black bed sheet for $3 at a dollar store. I sold a ton of ornaments two weeks ago. The sled ornaments were a big seller and I always sell out. I'm making 30 of them for my next show.
Protraits get a lot of attention and bring people to the table. If you have one that is framed, put it in a prominant place so curious people will come in and see the other stuff you sell too.
Have a blade or two with you. So many people asked what kind of laser I have. Haha!
If someone is eyeing something, tell them a little about it. Many times they don't want to be the ice breaker but they are interested in some stuff.
I always have a few cheap items in the $2 to $6 range. And I always say, "These make nice stocking stuffers." Bookmarks work well for me.
Dan