Did you know that the most valuable thing in a Tiffany's Jewelry Store comes free with every purchase but you can't buy one at any price?
It's their signature robin's egg blue shopping bag and it makes everything Tiffany's sells, from a simple silver key fob to an omigod engagement ring worth much much more.
Even though Tiffany's shopping bag design is taken, here are some other brilliant designs collected from the web: