My dads birthday

My dads birthday is the day after New Years. For my moms bday I sent her a coffee cup with my 8 month old sons hand print in paint on it and she loved it. He’s the comedian in the family so I wanted to do the same thing with my sons butt cheeks because Ik he’d love that (don’t judge me! 😂) but idk what to put it on! The coffee cup is probably too small for his butt so anyone have any ideas?

He likes coffee, comic books, old cars, and grilling. He’s also roofer and had lots of tool sets