I don't know of a source for candle moulds but as long as you have candle mould sealer you can use:
plastic cups
plastic pots
the bottom of plastic bottles
sand (you can use glasses to push in shapes or make your own freestyle - just remember to add 'legs' by pushing your fingers in and and if desired, push seashells into the sides before adding the melted wax)
silicone poached egg moulds
an egg shell with the egg removed (duh!)
egg trays
the foil cases that shop bought mince pies come in
metal mousse trays
You can also use tins (pick ones without a lip or you won't be able to get them out!).
I also look out in local junk / charity shops for attractive glass containers I can use . Cocktail glasses are good and then you can then either use it as a reusable mould or make the glass part of the candle by making 'contents' that resemble a drink (I do a good tequilla sunrise!) or by making the candle stripey - and you can also tilt the candle between layers.
Two other highly effective candles:
- Just before you add the melted candlewax, pack your mould with crushed ice. The was will set as soon as it hits the ice and will leave you with a filligree appearance on the surface of the candle. Make sure that the centre of the candle has alomst slush rather than ice so that around the wick there is a fairly solid layer of wax - otherwise the candle will collapse when lit.
- You will need:
a bucket of cold water
a tapered candle
a bowl (I use a cereal dish) covered in foil
melted wax sufficient to almost fill the cereal bowl
Pour enough wax into the bowl to cover the bottom (about 2cm deep) and hold the tapered candle in the middle, pressing down firmly until set (about 5 mins)
When set, carefully float the bowl on the top of the water, taking care not to spash any water into the bowl. Carefully fill the bowl with wax until about 2cm from the rim. Grasp the top of the candle and at the same time push down and twist into the water. You will end up with whisps of wax surrounding your tapered candle - it looks very dramatic but is often fragile and difficult to transport far (but not so fragile that you can't carry them round to the neighbours!)