Goodhousekeeping.com has a great place to download and print your own bookplates. Check it out here.
They have 3 different designs. You print them out on self-adhesive lables (like Avery) and then you have ready made bookplates. These are great for books, gifts (friends, teachers, etc.), you can put them on movie cases, and lots of other useful places.
Where are all the places that you could use a bookplate?