Beowulf: The Center of the Universe (comment)
"Authorize the US Mint to stamp $1 billion or even $1 trillion coins. Geithner could hand-deliver them to the Federal Reserve Building as needed. :o)" (original).
And further down in the same comment thread:
Curiously enough Congress has already delegated to Tsy all the seignorage power authority it needs to mint a $1 trillion coin (even numismatic coins are legal tender at their face value and must be accepted by the Federal Reserve)– the catch is, its gotta be made of platinum (ditto the balls of any President who tried this). So for a 1 oz. coin, Tsy would net only $999.998 Billion :o)
(k) The Secretary may mint and issue platinum bullion coins and proof platinum coins in accordance with such specifications, designs, varieties, quantities, denominations, and inscriptions as the Secretary, in the Secretary’s discretion, may prescribe from time to time.