1- 10 oz. package semi-sweet chocolate chips
1/3 cup light corn syrup

Heat chocolate chips in a microwave-safe bowl at 30 second intervals, stirring thoroughly between each heating.  When chips are completely melted add corn syrup and stir until mixture becomes thick; the chocolate will lose it's shiny appearance. 

Spread mixture on a large piece of wax paper with a spatula and top with another piece of wax paper. Gently even out with a rolling pin or by pressing to 1/2" thickness.  Let dry 2-3 hours.  Cut with cookie cutters, or break off pieces and knead until pliable and putty-like.   Chocolate sculptures will harden when left out to dry.  Place unused clay in an air-tight container.  Discard after 3 months.