To make 3D Sugar Cookie Skulls you need
Sugar Cookie Dough(recipe and video ), don't use baking powder. Linzer cookie dough (recipe) works great also
Scull Mold - I got mine at a Dollar Store, you can also purchase one here if you don't have a Dollar Store around.
Smart Balance Butter Spray
Food Colorings- I used Americolors, use gel based colors if possible, they will produce vibrant color results.
USA baking pans - I love using these, the results are great
Learn how to make these fun cookies in my video