Show and Tell for a 3 Year Old

I was just getting a Mich Ultra out of the fridge and noticed junior's class schedule for preschool showed this Wednesday as Show and Tell.

He doesn't really have anything cool to take that would be appropriate. We live in an relatively affluent area, luckily, but we ourselves aren't doing great, on account of the guy we bought our singlewide from lied to us about the septic tank and we just spend $3300 fixing that, then both cars broke down and our credit cards are maxed out. So we can't buy anything nice for him to take and show off. And he doesn't have a whole lot of material things like toys and whatnot. He really just likes to watch TV and play with regular stuff like sticks and nature stuff. He used to like to play with his dog, but you can't bring a dog to school and we had to euthanize it anyway, so whatever. He likes to play with empty boxes and junk mail too, but that's not really show and tell type stuff.

I'm kinda stuck. I don't want him to be the only child that doesn't bring anything.