Hello Gothamites! I have a little request I am hoping you could help with. :)

I am in the middle of a poster project -- I am the designer of the Arkham Roster poster, if you've ever stumbled upon it on etsy or pinterest, and am doing a Gotham version of it upon recent request -- and am looking to add some "sketches/graffiti" of the symbols that have been used by the villains in the show to add some flavor to it.

For example, I'm including the Cult of Jerome smile, Ed's question marks, etc. I'm having trouble coming up with others, though, so I thought the Gotham hive mind would be a great place to come to get some ideas! :3 With that said, any suggestions? Anything you've spotted while watching an episode recently that might fit what I'm looking for?

Thanks in advance for taking the time to read, and I def appreciate your ideas! :D