I had quite a few in my room at college. I had a Nirvana poster with the members of the band in black and white, two Alphonse Mucha posters (Autumn from one of the Seasons series and I forget what the other one was of), a poster for the movie Another State of Mind (about hardcore punk in the 1980s), an A Tribe Called Quest poster, and a poster of Effy Stonem from Skins. I also had a poster from DeviantArt that my friend got me for my 16th birthday, which had a row of silhouetted penguins and one of them had a mohawk

And I had one of Angela Chase from My So-Called Life and one of the painting "The Storm" by Pierre-August Cot, but they fell down and got ripped sadly
Plus I had a bulletin board with a calendar and a bunch of random stuff (like this drawing of a snake my friend drew and gave to me which I still have, random postcards from my friend, concert tickets, a picture of Guy Picciotto of Fugazi singing while hanging upside down from a basketball hoop, pictures of various fashion-related things, etc.)
Here's the problem with posters -- they would CONSTANTLY fall down and every time they fell down and I had to put them back up, they would get more wrinkled, ripped, and generally destroyed. That's why I sadly had to throw all my posters away when I left college. I want to get some art prints to put on our walls now that my fiance and I are getting my own apartment, but everything has to be framed so that won't happen again. Otherwise it's just a waste of money.
I don't have much on my walls right now because my current living situation is cramped enough as it is, but a few things have made their way up there. I have three calendars (one with various protein structural models that I got at a work conference LOL, one with rescue animals, and one with horses), the aforementioned snake drawing that my friend did for me, a couple of pictures of me and my fiance, two cards with beautiful nature drawings, and a couple of other random things. When we move some of that stuff will go into a memento box instead of on the wall, and I think I will probably install a bulletin board over my desk or something to put other random things on.
When we move I want to have a fair bit of art. I want to get a Mucha print again (one of the Seasons series) and Pierre-Auguste Cot's "The Storm" again, and the snake drawing of course, and I definitely want the Guy Picciotto hanging from a basketball hoop picture on my bulletin board. And I definitely want some David Hockney prints, maybe for the bathroom or something. I also have this embroidered framed sort of sampler thing that my brother gave me that has flowers and butterflies on it, it's really 80s looking and I like it a lot, but I have nowhere to hang it right now so it's just propped against the wall.
So in a word: yes.