Graduating is both exciting and terrifying with so much to look forward to and so much left behind. They will face many challenges and may want to look back to remember how they got to where they are.
You can give them that with a photo book full of their memories. You could have their favorite inspiring song lyrics throughout the pages or maybe information that they will need to know when they are on their own. Maybe include a few of their favorite recipes, whatever you think might make them smile.
If you want to get really fancy, consider having a digital flipbook created for them. You can include videos, audios, links to youtube videos, etc.
Whatever route you chose to go, they are sure to cherish it.
Check out some great graduation song options that you may want to find lyrics for.
My personal favorite is The Climb by Miley Cirus