A rite of passage for US PhD students is the title page of their dissertation. The way that faculty indicate their approval of the final dissertation is by signing the title page, and students are required to leave space on the title page for this purpose. It's up to the student to run around to all their committee members (mine had 5) and get them to sign. Holding the final title page, with all the signatures, this bland sheet of acid-free paper that signifies that your hard work has come to something... it's a heady feeling.
Often people go to a bookbinder to get bound copies made as gifts for their parents and PhD supervisors. I had a copy bound for myself as well (boy was that a mistake). So here's my tip: Keep a photocopy of your signed title page. Then, when you get your thesis bound, you can include the signed title page with all the bound copies. This looks much nicer than a title page with blank signature lines, which gives the faint impression that you're trying to pull something over on someone.