I was visiting with one of my friends this week and saw the most magnificent mason jar ever. This thing was huge (at least 5 gallons) and it was filled with Christmas lights. I tried to recreate the effect using quart size mason jars and I love how it turned out.
To make your own take one strand of lights and fill jar. The end. Simple. Modern. Cheap.
I wish I had battery operated lights, but since I don't my strand comes out of each jar and hops into the next one. We opted for the small fake tree in the window with Destructo Baby on the loose but I love the way a fresh cut tree smells so I might see what the jars looks like with some evergreens around it.