I have actually started on a project where the currency is a piece of cloth (a scarf) and it's backed by 1gram of gold. Would be fun to see how FBI, FED and the bankster would try destroy that once it gets adopted.
PM me if u want to preorder one. They are called Aurum Shields.
Why not just use Shire Silver? (
https://shiresilver.com ) We have the world's smallest physical gold trade unit at 1/20th gram of gold as well as tenth gram, half gram, and tenth dinar (0.425 gram). I put my idea into the public domain so anyone can use my model, and I even have instructions on the site. The cards are credit card sized and fit well in wallets, yet contain the actual gold (or silver if a silver card). No separate backing needed.
Coming soon is also valaurum's plastic notes (
http://www.valaurum.com/ ). I have one in my wallet (we traded products as friendly competitors). They use the same plastic that is used for modern banknotes, but with gold sprayed/printed between the plastic layers. They are calling theirs "aurum" so you might find yourself dealing with trademark issues - they seem more traditional when it comes to business and might get lawyers involved.