sorry sweet, only just seen this!
Oh so these are suuuuuuper easy - I totally cheat at candles 
I have a load of tealight candles/old candles with burnt out wicks so I:
- take out all the wax and melt it down in a clean tin over a pot of boiling water (thrifty double boiler style)
- pour the wax bit by bit (allowing to cool a little between pouring so you can add herbs/spices) into these silicone moulds I got ages ago (technically for frozen shot glasses but they work beautifully for candles).
- Let it cool and set. Take them out of the moulds.
- Grab a long wick and dump it in the middle, gradually pour more hot wax in the ‘shot’ section.
- Allow to cool and hey presto!
P.S. I loooove your art!!!