We always pull our card table out for the kids when we have people over for dinner. I have an inexpensive (and pretty ugly) tablecloth that I usually throw on top, but last time we had dinner guests I grabbed my daughter's roll of butcher paper to cover the surface. I had fun doodling pictures for the kids to color, and it was a hit. We ended up keeping it up overnight, and my daughter did some more coloring the next morning. Simple, inexpensive, and interactive - win-win-win.