This is the most unconventional way to fill a room that looks empty. The US Bureau of Engraving and Printing sell uncut currency in sheets which are usually framed but can be used as wall paper. It is available in denominations of $1, $2(pictured), $5, $10, $20, $50 and of course $100 in sheets of 32 notes. The $2 note version is the rarest due to the rarity of the $2 note, however the $100 note is only availible directly from the Bureau of Engraving and Printing.