Eden Rodriguez, owner of End Design in Santa Rosa and Mill Valley, places garden stake lights or a small battery-operated camping lantern under tablecloths.
To hide an electrical cord, she parts the grass, tucks in the cord, and stakes it with a U-shaped piece of wire. If you're using electric lights, keep fabric 2 feet from the bulb.
For extra shine, you can create a table covering from brightly colored ― and inexpensive taffeta. Use fusing tape to secure panels together and tuck unhemmed edges underneath.