I'm sorry. I can't rock the full-on comic book t-shirts.
That Red Lantern shirt is cool, and I'd imagine there's a lot of iconic designs like that I'd actually be down to buy. The Red Lantern circle could easily pass as, say, the logo for a skate company. For that matter, I'd happily wear a design with all the different colored designs on the front and "CORPS" or something etched on the back in the GL logo design. For me, it's all about the design element. There's no chance in Hell I'd wear a shirt with Wolverine hopping out the front of it, or anything like that.
However, I'd kill for a slick looking Umbrella Academy t-shirt (i.e. the different kids with the numbering along the front, like from the first issue, and the names along the back) or a two-tone Casanova hoody.