This is a fantastic alternative to a guestbook for a graduation party: have each guest write some advice on a game piece. For delicious graduation party dessert ideas, check out http://simplycreate.com/.
I made a Jenga "guest book" and painted all the pieces Tiffany Blue for guests to sign with nice paint markers. The color of paint is actually by Glidden and called Shimmering Blue Pool. Tiffany Blue Wedding