So what I used was food grade silicone. There are many brands who have different names for it.
There are different grades, cures, durometers, (how flexible it is)pot life, (how long you have to work with before it cures)
So you must double check each products specifications.
The main difference is that food grade silicone is non toxic and is platinum cured versus tin cured.
The specific product I used was Smooth on Sil 940, sampler size.
It's 2 lbs and about 40 bucks. But it's easily enough to do a few molds. The kit comes with complete instructions and there is a phone tech support in case you get lost.
Just googling "food grade silicone" will find you what your looking for.
Here is the same product, different company, on ebay:
Find some place near you that sells it, Tap plastics will be carrying it soon.
You will need the following materials:
-Han Solo in Carbonite toy
-Foamcore (it's usually white paper with a foam core)
-Glue gun with a few sticks
(Big tip here, you can use Legos instead of the foamcore/gluegun method, I'll explain later)
-Food grade silicone ( if you ever wish to use food products in the mold, otherwise regular silicone will work)
I watched all of the videos available on Tap plastics website before I even started. I suggest you do the same to make the process full proof :) Especially on mold making!
Remember you can cast any object. And if you can cast any object you can mold anything into chocolate!
Someone out there is already working on a battle of hoth scene in chocolate. Complete with chocolate AT-ATs and powdered sugar for snow!