Popcorn!

Shortest post ever.
You know what is a super easy way to fill out a cart full of carnival treats, popcorn.

I bought these plastic boxes foe $1 each at JoAnns, but you can also find the cardboard ones at party city.
I filled them with a couple squirts of Great-Stuff and let them expand and dry.
After they were dry I cut them up a bit with my matte knife so it didn't look like one giant piece of popcorn in each box.

And the best part, no paint needed, the foam is already a perfect color.