Any one of these is good. :)

-A card with a "3-part split screen," as can be seen here and here.
-A card with a color theme. (Primarily uses the color yellow, blue, pink, etc.)
-A card that depicts a dark romantic relationship. (Any pairing is fine. :P)
-A card that only has one word on it, but the word describes the image well.

Good luck and thank you!