So, here is the promised tutorial, I made a new candle for it:
What you need:
a candle in a colour you like
an exacto knife
a sharp pencil
decorating wax (the one you buy as thin sheets)
liquid wax in black (and white if your creation has white eyes)
printed design you want to put on the candle (in the right size)
First you place the print on the wax (you can start with any colour you like, I prefer to work from the middle to the edge or from one edge to the other because otherwise you might find that the last piece does not fit to the others...).
Now trace the lines with the pencil, this should carve into the wax.
It should look like this after you have removed the print:
Now cut along the outlines with your exacto, place the piece of wax on the candle and press carefully.
Repeat this for the other colours.
When you've finished this, smear the wax a bit so any gaps are closed:
Now draw the outlines/details with the liquid wax. I use a toothpick to apply the wax, it works best for me but it still looks messy...
The last step is to wait until the liquid wax has dried (appr. 24h) and then scrape off the liquid wax splotches (to get fine, even lines). If your lines look fine and even, then you don't have to do this, but I never manage to make them look good enough...