Display Chocolates

I would like to display my products in the store window to bring in customers. Obviously I can not use standard chocolate, it would be a puddle of melted chocolate in no time.I would like to make the chocolates represent what I actually sell in the store so need to use a substitute that will not ruin my moulds. If anyone has succeeded in finding and using a good product that remains intact for a reasonable length of time, especially in a sunny location, and of course doesn't affect the moulds, I would appreciate the advice.