I think they should do Super Mario Bento Boxes.
It's a step above just naming the stuff after Mario characters, since it looks like them too. And speaking of naming food after Mario characters, I'm partial to the idea of Koopasta with Goomballs myself.
More: Cheep Cheep Tacos with fried Blooper Rings. Big Boo's BBQ Burger with Shy Guy Fries. Petey Piranha Salad with Yoshi's Island Dressing, Rosalina's Rotisserie Chicken, Birdo's Bob-omb Poppers, Waluigi Wahhhhntons... etc., etc. you get the idea.