I really like this industrial take on a candle by Fabien Gerlier. It is textured, minimalistic, and just plain cool. I love that there is a bit of magic, as the fuel source is not obvious. Any perhaps, from the picture, it appears it can even be used to roast marshmallows?
Of course, if taken apart it can be seen there is a porous lid which covers a standard butane reservoir. The gas seeps up through the porous, creating the flame.