I don't really keep a lot of posters on my walls. I like things simple.
In my apartment I have a picture of "Rosa Meditativa" by Salvador Dalí on one wall, and a Guatemalan tapestry on another.
In my room at my parents' house, I have a signed poster from the 1996 Thunderbirds, and a small computer graphic a friend did and gave to me when I was in high school, and a drawing I did of the band Pink Floyd.
I plan to put up more of my musician portraits when I get out of grad school and get them framed. I'll have kind of a Wall of Fame thing going...so far, I have Richard Wright of Pink Floyd, Hansi Kuersch of Blind Guardian, and Russell Allen drawn to my satisfaction enough to frame them and put them on my wall.
Now here's a question...would it be really dorky or not to have a drawing or two of fictional characters from a novel I'm writing, also framed and hung up? There's 1 so far that I had a photo reference for (used an actor) that I might consider in that case...