Choc A Bloc is a silicone cake mold (mould) that is shaped like a 8" x 5" x 2" chocolate bar. It is food and microwave safe. The cost with shipping is about $11.00. Click on the link or picture for purchasing info.
Of course, while this is designed for cakes, it certainly can be used with many other things, such as chocolate, ice, butter, fondant, maybe sugar (says oven safe to 428 degrees). I'm sure many other non-food applications would be able to use this as well.
This mold comes from Just Mustard, a unique novelty product company. Very interesting products from party to kitchen. If you have time, check it out.