the dollar is called a 'Loony' because of the loon on back of the coin... 2 dollar coin is called a Toonie... tho' there isn't a toon on the back.. just polar bears (on thin ice)... the rest of the bills are multi-coloured..

5-blue
10-purple
20-green
50-red
100-brown (my favorite)

no more 1000 bills.... something about the war on drugs or trying to prevent large amounts of cash being easily transported and used for illicit activities... like trying to rent a 'toon'....