As a little girl my favorite book to read or have read to me was "The Very Hungry Caterpillar". My mom and dad would read it to me as often as I wanted to.I hope my kids enjoy reading this book as much as I do.
Mix grass seed in with potting soil. Fill up a nylon. Tie into segments with string to make a 'caterpillar." Soak in water till saturated. Then let the kids spray it with water every day after and watch it grow. When the grass gets "too long" let the kids give it a "haircut."