Spreading Bitcoin with FIAT Currency

Let's assume you have a few thousand Bitcoins and you want to use them to spread the idea of bitcoin, what would be the most effective to spread Bitcoin using that money?

You could put up large billboards or pay for a newspaper ad, but that's too local. You could make a hit YouTube video, but that's too random.

Enter FIAT <3 Bitcoin

Everywhere around the world, people with Bitcoin can easily help spread the word of Bitcoin by simply using a modified FIAT currency.

All you need is some plain old FIAT currency bills, a permanent marker, and some spare Bitcoins that you would like to contribute to that cause.

Using Casascius Deterministic Wallet Generator (https://bitcointalk.org/index.php?topic=34163.0;all) you create a new bitcoin address and convert the private key to Mini Private Key Format (https://en.bitcoin.it/wiki/Mini_private_key_format) and write it down on a bill stating that who ever uses this private key first gets the bitcoins associated with that private key.

The beauty of this method is that you can easily redeem the bitcoins after a while (2-4 weeks?) if you see they aren't spent yet, you could track new Bitcoin usĕrs and where they are coming from (geographically, and perhaps even more details if they are willing <facebook "Like"?>) if there was a site dedicated to converting the mini private keys (MPK Code[s] from now, ok?) to bitcoins and špending them off (this could be combined with existing Bitcoin services, and the site operator would profit from affiliating to the services and getting them new customers).

Example: http://imgur.com/DJfmw

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