The first three cards are from one of the best art card sets out there, 2003 Topps Gallery.
It's hard to tell from the scan but this is the shiny "artist's proof".
These two are the base version. The one on the left is the striped hat variation. I have no idea what the relative scarcity is (if there is any).
The next three are 2005 Upper Deck inserts. Each one is serial numbered to 50.
Not a bad buy for less than the price of a pack of flagship.