Found this on one of the Russian crafting sites, and fell in love with this idea. Seems that all you pretty much need is some embossing soft metal/foil (I believe most well-stocked craft stores would have something like that).
The site does warn against using candles, even tea lights, near a Christmas tree. I would suggest actually going without fire, but instead invest in some fake tea-lights, which are basically small LED lights, shaped like tea lights, and even have that artificial candle-like flicker. They usually come with batteries as well!