Food items: there was an occasion where there were a lot of D&D monsters too big to be represented with ordinary tokens, so I used
Garibaldi biscuits for "you kill it, you eat it."
I also used
Smarties as a tool in a
Toon demonstration game. I handed out small packs to all the players at the start. Part-way through, I checked who'd eaten theirs and gave them more. The idea was that holding back and resource planning is not rewarded in Toon, doing things immediately is a more entertaining style.
Very occasionally I'll make up documents. I did a shipping label mostly so that the players could see that the person who sent the god-in-a-box had signed their name as "Illegible Squiggle" and the "Checked" field was just blank.