I think Strange's glasses would make for better symbolism, or perhaps a camera. The eye looks good, it's just that the Joker isn't exactly known for his eyes.
In fact, the more I look at it, the less it looks like an Arkham City box. The Wayne's graves never appear in the game, only their chalk outlines. The city's outline along the box might look pretty cool. This, along with Strange's glasses behind it would make for awesome symbolism.