Hey i'm an illustration major and i've gotten into designing T-shirts! I have several comic book inspired designs and some other nerd-friendly stuff! You can see my whole portfolio here: http://www.redbubble.com/people/mbecks114/portfolio
But here's my Justice League Band design and my World's Finest Championship Design:
And My Newest Comic book design is inspired by Superman #199 and subsequent Superman/Flash races ! It's still kind of a Work in progress, so im still trying to get feedback on it. Let me know what you think!