Shelley's blog had a link to a site with free book plates, and I saved several for illustrations on my blog. Isn't this one by David Roberts cute? The book plates on this site are mostly geared toward children and can be printed out and used in your books if you so choose. But I warn you, you are going to be seeing them here for awhile. :)
I've always found book plates fascinating, but have only rarely actually used them (although I've bought them on several occasions). Shelley's November Booked by Three has a meme concerning book plates:
1. Do you use bookplates?
Not really, but I love looking at them.
2. Do you write your name in your books?
3. Do you attach stickers with your name and / or other info into your books?