Congratulations on your upcoming achievement, both in the certain and the probable instances. Pop culture is full of them, so could be a starting point. A lot of them are full of cliche motivational stuff that is stock-standard in the genre, so you can go that route; I've included some from youtube that I could find that might give you some ideas. I know I pull out some Dr Seuss The Places You'll Go with my graduating classes. Here's a (you need an account to see links)of the book, if you're unfamiliar with it.