I did this at TechShop Menlo Park. http://www.techshop.com
With a vacuum former you can form food grade plastic to make molds for chocolates and other food items. I documented the process.
Step 1: Turn on Vacuum Former
Big red switch in the back powers the vacuum former on. The Object to be molded gets placed on the screen and dragged down with big handle on the side. Plastic is loaded into the frame and latched on both sides. Turn on switches to heat areas as big as plastic sheet.
Step 2: Vacuum Form
When the plastic starts to sag pull large red handle toward you and push mould button. Then push release and retrieve the object.
Step 3: Melt Chocolate
I made a double boiler out of a crock pot and melted chocolate chips
Step 4: Melt
My first melt batch ended up overcooling and rehardening into clumps. Then I added a little oil to the second batch and got the desired consistency.
Step 5: Pour and Decorate
I I added coconut flakes to the bottom while chocolate was still molten to make furry bottoms.