Egg Cartons

I was fixing supper tonight when this idea hit me. I've seen egg cartons used for math games. You know put a sticker/write on number in each section and then shake up marbles or cotton balls to add the numbers together? How about putting word families into the section of the egg? Students can shake a cotton ball (it's quieter during center time). Let's say it lands on -an. Students would add a letter to create a word. For example can. Then they would write their created word on paper and draw a picture to go with it. Would be a cheap center to create--and easy to check.