Looking over my Kappabashi page recently ended up leading me to this store's webpage that sells sample foods made from plastic. The kinds Japanese stores put in their display case to show what they are selling.

For example, sushi, pastas, cakes, cocktails, fresh fish, fruits, fish meat, crapes, kushiyaki, parfait, soft ice cream, hand rolled sushi, tropical drinks, veggies, Japanese candies, Japanese dishes, cooked fish, etc.

There's even some pictures of how they make them.

If you are in Japan you can check out their store. Remeber though, they are not a tourist attraction, they are a store that is in business to serve restaurant owners so be nice.