Combine sugar, water and syrup into heavy saucepan. Set candy thermometer on pan. Stir constantly. When candy thermometer reaches 300 degrees (hard crack), add in the flavoring and food coloring (only a few drops). Stir in and immediately pour into buttered 9x12 inch pan (depending on how thick you want the pieces of candy).
Let stand. Mixture will harden. Make sure it is completely hard before going on to next step. Pick pan up to about waist level (you may want to take pan outside and do this). Drop the pan on floor. Candy should break into several pieces looking like stained glass windows. Great for kids to be involved with and good for gifts.