Dollar Bills crafted into art.

It is generally legal to use money for art, provided the artist does not have fraudulent intent to alter its denomination or create counterfeits.  While Section 333 of Title 18 of the U.S. Code prohibits mutilating currency to make it unfit for reissue, this is typically only prosecuted if the intent is to defraud or destroy the currency.

So the question becomes:

What is the value of a dollar bill when it is used as a medium?