I burn candles all the time and always have those ugly burnt up leftover jars sitting around. The crafty packrat in me wouldn't let me just throw them away after they wouldn't light anymore.
So I bought a pack of wicks, which were super cheap, $2.oo for 1o. Melted the candles in the oven, cleaned out the jars and decoupaged the outside. Just some random stuff I found in Juxtapoz.
Anchored the wick with a dab of hot glue, poured wax in jar. Added some simmering oil I had laying around.
Let cool, and voila. And I get to recycle the unused jars that I cleaned out.
These were kind of my testers, so they don't look that great but I think the idea has tons of potential.