Consider having bitcoin as hard currency for transactions or the purchase of commodities. Bitcoin is a decentralized electronic currency that is accepted on practically every continent in the world. The bitcoin note is going to be the most elegant and simple-to-identify physical cash in the world, and I wonder who face would have been drawn to it?
There are several projects who already created Bitcoin notes with interesting designs, but they are mostly used as collectible items.
Someone could always create fake bitcoin paper notes and scam people, same way like we have fake fiat currency notes all the time.
Another alternative is to use something like Satodime cards from Satochip, they are open source, and you can easily preload them with any amount of coins and use them as offline payment.
You can also print your own design or buy blank cards and load code from Satochip.
Here is one of Satochip special halving edition cards that are now sold out:
Not sure of how successful Bitcoin note project can be, since Satoshi's idea was something far from the fiat currency note. The very moment we start to have counterfeit in relation to Bitcoin due to the implementation of Bitcoin note, then Bitcoin won't give us that true value it was designed for in the first place.
I am quite familiar with Casascius Bitcoin and not the satochip. But since the both of them still observe the protocols of Bitcoin, then they are worth using for very small transactions. For the satochip, it would make more sense to load it with a Bitcoin whenever necessary. I think I buy the idea of these two instead.