Light-Up Light Saber Cake

(Above: Light Saber not lit up; Below: Light Saber lit up!)
For little Carson's birthday this year, his mom asked me to do a Clone Wars cake, like the new cartoon show based on the Star Wars series. I did a miniature light saber cake to go along with it, and figured out a way to make the light saber light up! (I refuse to make a LIGHT saber without a LIGHT.) I put a toy inside it that lights up with the push of a button. It turned out so cute!