This website, Making Your Own Molds, has a bit of information about using silicon for making molds. Could be a good material to mold candles in, easier than a solid mold to get the finished product out of.
Layered Candles, poured into a mould one layer at a time.
Jar candle, molten wax poured into a recycled jar.
Pharrell Williams Star Track Candles. Wax poured into a mould shaped like a hand.
Cut and carved candles. Hand made, layers of wax going inwards and being displayed through cutting, peeling and folding.
Bees wax candles. Layer of bees wax is rolled around the wick to create a cylindrical candle.