Funny you should bring this up! I used to do that when I was a kid and when my 8 year-old came home and told me her math book had to be covered I brought out a trusty paper bag and covered the book with it. Then I got out the magic markers and let her decorate it. When she came home the next day, she told me that the other kids in her class loved it and wanted to know how to make them!
I'm such a cool mom! lol