Teachers spend ridiculous amounts of money on resources for school. With most resources I just name on the front cover with a black permanent marker, so everyone can see that it is mine at a glance. One particular vice of mine is to purchase beautiful, beautiful picture books. And when I spend all that money on a new picture book I want to keep it in pristine condition and ensure that it comes back to me if it is borrowed.
There is something about a bookplate that makes a book really special. Try going to http://www.myhomelibrary.org/bookplates.html for the cutest printable bookplates to put inside your favorite books. The artwork on each book plate is divine, and the plates come in both color and black and white. Happy printing!