Paper was the main GNE currency (shekels? pah!) and could be transformed alot. The above is a transformation matrix which i *think* is complete.

Sheets, quires and even reams of paper grew on paper trees throughout the world.

Red paper grew in the firefields. Yellow paper grew in the desert. Blue paper grew in City Undersea. Green paper grew in the swamplands. Brown paper grew in treehouses. Purple paper did not grow anywhere, but could be sold for 5,000,000 shekels per sheet.