"This is an ATC, または Artist Trading Card. It is a miniture piece of art done most commonly, as this one is, on a playing card. It measures 2 x 3 inches (I'm sure it will appear larger in the graphic)."
Clips from Castle, Doogie Howser, M.D., Dr Horrible's Sing-Along Blog, Firefly, How I Met Your Mother, The 61st Primetime Emmy Awards, Two Guys, a Girl and a ピザ Place.