There is, already, technically one for steampunk. However, some had complained about the lack of a white "stamplike" border on it - so here's another one.
What is steampunk? It's easier to grasp than one might think. The concept of the Industrial Revolution of the mid- to late- 1800s is pushed into overdrive. The heroes are often inventors seeking to promote peace, or oppressed factory workers; the villains are often mad scientists or arms dealers. Instead of the great inventions being things like the dynamo or spinning machine, they are often enormous, coal-powered monstrosities that wreak havoc on Victorian London - all while never once defying the laws of physics.
The image is a screenshot from Katsuhiro Otomo's "Steamboy".