We want to get across a hint of a film noir feel. But at the same time, we want to have a strong pop of color. We're also strongly considering painted edges on the cards.
With the possible noir elements we'd prefer more towards the graphic / abstract end of the spectrum. No photos, please. Shadows from blinds, silhouettes in a doorway, streetlights, alleys, etc... Or it could just be conveyed through use of color & a cool dutch angle.
We've provided some variations on our new logo to play with. We are going to want to use the primary logo (the one with multiple colors) on the card, but the other ones may be useful for design reference.
Overall, it should feel more fun than serious. In our ideal card, someone would look at it and think we're: "Pros, a little dark, a little weird, but definitely fun to work with."
This may be useless, but the song "Princess Crocodile" is pretty much the musical equivalent of the tone we're after.