I think it's great to see all the various, cool and innovative ways people are coming up with to deliver and promote BTC.
This is one of those cooler ideas IMO. That there are only 10 being made and, I believe, most of them have been accounted for means that duplicating these for profit wont exactly gain you much.
What with this and the Block Bills recently released, things in the Arty world of BTC are moving along nicely
Viz