When I shared a room with my sister, we had a poster of Elvis on our wardrobe door. It was from the magazine Valentine and came in three parts. Our room was also decorated in pink and black, at my sister's insistence, because they were Elvis's favourite colours.
I loved Paul Simon, of Simon and Garfunkel, when I was about 13 and had his picture next to my bed. I cut it out of Fabulous. I used to kiss him goodnight, until his lips went wrinkly.
I think I had various posters but eventually narrowed it down to a large poster of Steve McQueen. He was gorgeous.