My daughter loves to paint. So, inorder to keep my daughter (3yr 1 month old) engaged, I cut the egg carton into pieces and gave her. She selected the paint colors of her choice and started painting the egg carton. I could see she was enjoying every minute of this activity and she learnt to paint into the creases or the uneven surfaces of the carton.
I am planning use these colored bits into making some more projects. Will be posting them shortly.