So, here are some backgrounds I made last night. The first two are images from 2 different comic book covers drawn By Jerry Robinson that featured the Joker. I thought these were appropriate since he created that character.
Then, the next two are a comic book cover he did with the Penguin ( That Villain's 1st Appearance! ). They also feature ROBIN, The Boy Wonder, another character Mr. Robinson created. It's also important to note that the last one is the Original Art for the previous image.