In Germany in the 1920s, towns, banks, and companies printed their own money called notgeld.
Notgeld was mainly issued in the form of (paper) banknotes. Sometimes other forms were used, as well: coins, leather, silk, linen, stamps, aluminium foil, coal, and porcelain; there are also reports of elemental sulfur being used, as well as all sorts of re-used paper and carton material.
A Flickr user has uploaded hundreds of examples of the notgeld notes collected by his wife’s family; they’re so colorful! (via design observer)