I love the Citibank ad I saw in the New Yorker. It has a great bookmark that you can punch out with Lillly from Lilly's Purple Plastic Purse by Kevin Henkes. The directions on the rest of the page read:
1. Punch out.
2. Find a kid.
3. Open book.
4. Read [out loud]!
5. Place in book when kid falls asleep.
6. Repeat steps 2-5. Lots.
And, to be extra classy, the bookmark doesn't even mention Citibank again, it just says, "To donate books to New York-area schools in need, visit http://www.projectcicero.org