It may be an Aspie thing, but not all people with Asperger's are that way. I know of two people that have Asperger's & one is a woman in her early 30's who's special interest has always been heavy metal bands. Her walls are covered with posters of various heavy metal bands. She uses them as wallpaper.
Also, for myself (undiagnosed, but I believe I most likely have AS or am somewhere else on the spectrum), I had my walls covered with posters from my pre-teens through my late teens/early twenties. I didn't remove them until I got tired of remarks from others telling me I was too old for all the posters. I'm 28 now, & haven't had posters on my walls for years, purely because of other people, & have decided that when we move within the next couple of months, I'm going to put posters up again. I already have three "The X-Files" posters & can't wait to buy more.
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?Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.? _Theodor Seuss Geisel (Dr. Seuss)