Here are some tips for LittleBigPlanet 2 which is available on PlayStation 3. These tricks will let you put your hands on the new stamps which are then available to the player. Here is the list of thumbnails and the means to obtain them.
Amy Birthday: July 29 play
Festive spirit: to put a suit on December 25 Christmas
Group Hug of 20 000: play online at the same time as 20,000 other players
Halloween: put the pumpkin head on Halloween
Mm Picked! : Having an object of Ms. Picks in a level set
Mm's Birthday : Play Thurs, January 4
Royalty: having a crown
Thanksgiving turkey: put the costume head of turkey on Thanksgiving Day
Who's Who: Watch the end credits