This is the bowl where Tony Hawk skated daily, building up his legendary career. I skated it myself a few times, but never got past the coping. Too many people watching (along with the fact that I wasn't a good skater).
The Keyhole was the main bowl at the Del Mar Skate Ranch in Southern California. The park no longer exists, but Tony Hawk does, and now you can take his bowl with you everywhere you go with the Keyhole Keychain.
It's a simple project and and prints quickly. Add a keyring and give it to your favorite skater. If you want the colors accurate, then print it in a marble filament and then paint a blue and orange line where the tiles would be.
If you decide to print it for skating then you should scale it up a few thousand times, haha. Feel free to ask any questions. In the future I might post the fingerboard version that the kids can use with their Tech Decks.
Enjoy, and please feel free to ask questions.