The first are the Big Gun decks. If I'm not mistaken, they're a USPC reprint of some decks they brought out at the end of World War One, I believe. They're quite a nice little set, and were only quite recently released; some time in 2011. I've also heard that only 2,500 of each colour were printed, although I'm not sure how true that is.
The second and third are the Gold Trace and Red Trace decks, respectively. They're designed by Merz67, and are commonly referred to as 'clip art' decks - decks that have taken hardly any time to design, and just use basic clip art images instead of unique, new images when it comes to the deck box, the Jokers and the ace of spades. This is shown by the fact that the Gold Trace deck box shows the cube with spade pips on the side; a piece of clip art.
The last deck is the Bicycle Smiling Back. It was designed by a magician called Meir Yedid, and is a gaff deck, or 'trick' deck. All the cards have smiling faces on the back, except for an extra four cards, which show a 'dead' face, with a bullet hole in his forehead that goes right through the card. The idea of the deck is that you force a card on a spectator, then cut the deck or what have you, and then pretend to shoot the deck. You then fan out the cards, and see one 'dead' face. You show the card, and it is the spectator's card. All the faces are regular Bicycle faces.
If anyone has seen any mistakes here, please don't hesitate to correct me.