Angry birds trading cards are found in US, EU, AU, NZ & Asia. Each card pack has a code to unlock Lime Bird. The cards are $19.99. You can make cards! There is no rule about "No making trading cards"!
Front of Angry Birds Space and Heikki Card
Back of the Angry Birds Space and Heikki Card
Angry Birds Seasons Merchandise Card (The back side is just blank.)
The bonus card for Bad Piggies. (Front)