Re: Quesera's food safe suggestion -
One very easy way to make Food safe moulds would be:
1: Buy some food-grade Silicone Putty. (u can google for it)
2: Make a "positive" at Shapeways from White Detail (whatever material is most cleanable and least porous I guess)
3: Clean, Smooth and Polish your positive. Perhaps seal with a food-safe lacquer.
4: Make a mould from your positive wuth silicone putty.
5: Eat your Chrysler building shaped cupcakes or whatever.
I guess the food safe silicone will come into contact with the non-food safe shaeways print
one time.
You could run your Silicone moulds through the dishwasher before castiing positives to be safe.
I there must be some kind of food hygeine standards you can look up and probably modify this process to conform to it.