We have this amazing six pack of waxplay candles from our friends at Darque Path. They come in two temperatures - Low and Medium, and glow beautifully under UV light. Each also comes in two sizes - mini and maxi. The maxis are about 175mm x 30mm and the minis are about 110mm x 15mm.
 
NB Waxplay comes with risk of burns and/or skin damage. You should seek proper training/instruction before use.