I have one wall of my room covered mostly in posters of my faves. Largely just Selena's magazine covers, a couple funny tabloid magazine covers (like the one of Sel and Miley claiming they both got pregnant by JB), and then Selena's vinyl inlays.
I have a Tiziano Ferro poster, Nathan Carter poster and 2 limited edition Nicki Minaj posters (I kept entering a competition and I got 2 posters out of it)
I think when I have my own place, I'll get posters of my various faves and just hang one at a time. Like put Taylor's up for a month, then swap it with Madonna, then Bowie, then Gaga, then Shania, etc.