craftgrrl | making candle/candy molds - anyone have ideas or experience?

Hi, I ran across several candles I would love to make similar items of in a larger scale. I love skeletons and saw some skeleton candles that were nice but way too small so I want to carve my own patterns/positives but am at a loss as to how to go about making the negatives. I've done some searches online but found places that sell molds already made and none that have make your own mold kits or instructions.

I was thinking I saw a long while ago some ideas for making rubber molds for candies, but haven't a clue where it was I saw that. Or maybe I was just wishing there was such a thing and remeber it wrong. Any comments, tips or links would be greatly appreciated.