Lets take 1 USD or 1 Euro. It's basically a painted piece of paper that serves as a universal exchange unit. It doesn't have any additional use.

But imagine that money were edible. When hungry, one could have a small lunch of tasty nutritious dollars instead of buying a $2 muffin :)

These edible money should be produced daily by the mint place (or rather bakery place), because they would be spent or eaten very soon.

(: Just rate this idea whether it makes sense or not :)