Books as party favors

When I was getting organized for my daughter's big 1st birthday party last weekend, I searched for a good idea for a party favor. I wanted something that would work across a large age range (0-14yrs), not be annoying to parents, fun for kids, and relatively green. Somewhere on the internet I read about doing a book giveaway box. Aha, the perfect idea!
We had lots of extra books to start with (duplicates or unread in ages) but I filled in by visiting my library's discard rack. Our town library is VERY small so the turnover is quite impressive - I've often found fantastic, new, award-winning, and generally unharmed books here. Children's books are 5 for $1. - wow.
Kids and parents seemed to enjoy it - and the above picture is what was left over (lucky me, right?)
Give this idea a try at your next party for little ones - it sure beats a bag of sugary treats and junky toys. The best part? Putting a book in a kid's hands.