I made the cellular lamp by nervous http://www.thingiverse.com/make:85515 and it looked really good but I had a different type of tea light that I wanted to put inside but the internal gap didn't allow that sized light. So I figured out how to do voronoi (texture? mesh?) and made my own, this is the first one that I've made and I really like how it turned out. Pretty sure I was pushing the printer to the max in terms of the horizontal sections but I printed this without supports and it worked great.
Makes a great centrepiece for tables, or adds mood at parties.
I recommend going to a local hardware store and looking for LED battery lights and seeing what you can find to fit. I included a picture above of the one that I used I got mine from Bunnings which is good if you live in Australia but I'm sure from the range that was there most people should find an adequate light to fit.
On my makerbot rep 2, I printed with rafts and NO supports, at 0.2 layer resolution, 0% infill with 3 shells.