Two piece plastic moulds. The novelty figurine candles are usually made with this kind of mould. These are more work than the metal moulds because when your candle comes out of the mould there will be a seam running around it that needs to be hand smoothed off. Some pigments stain the plastic, and use of high concentrations of scent oils will damage the plastic making them unusable.
Soft rubber moulds. These are one piece, and easier to use than the two piece rigid plastic moulds. They come in many shapes like the plastic moulds (fruit, figurines, etc.). Cooling wax inside the mould can harden and distort the shape of these sometimes.
Hard rubber moulds. These are not as long lasting as the other kinds of moulds and can be more expensive. Results are good and they are very easy to use.
plexiglass moulds. I have never used this type, but
books have indicated that they are easy to use, and
produce excellent quality candles. The bonus here would
be that you can see your candle through them ....good for
making candles with pressed flowers or herbs. I have had
good success with just sticking the herbs or flowers on
the candle after it comes out of my metal or home made
Other moulds and containers.