If anybody wants I can send 1,000 Owl Coins as a test.
It's a Colored Coin that runs on Bitcoin network and the Open Assets protocol.
You will effectively receive 600 Satoshis carrying the Colored Coin meta data.
In order to be able to receive the Colored Coins correctly you need to have a bitcoin address / wallet that understands the Open Assets protocol. In practice this means you need to create an account at Coinprism.com and then give me the address it created for you.
Sure, I'll bite. I created a CoinPrism wallet and was assigned the address: 1DAXAwYFencj3CXWhcjUg6Fvo3JhjRxrev
So are OwlCoins redeemable for anything real or are they just for experimentation?

I am still interested in the answers to these two questions:
1. Does the open-assets protocol have a formal and publicly-visible method for an issuer to remove the color from a coin?
2. Can colored coins using the open-assets protocol be traded via coinjoin transactions?