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I typically go for just symbols and subtle stuff like a Venom/Symbiote shirt, the Iron Fist dragon, and most recently the Iron Spider from IW.
I've actually gotten compliments on the last two somewhat recently, some girl in a game store remarked about how much she liked the Spider-Man one, and some dude in a parking lot did a hand thing and bowed for some reason for the Iron Fist one. Kinda neat.