sorry anon this was genuinely hard to answer bc I didn't grow up having a room for myself (still don't LOL) but in a hypothetical case that I had the chance to decorate my room, I'd love to put up posters and prints again! I got really into buying them when I went to uni since it was the first time I had the chance to decorate a (shared) room and I just love the look of a wall full of stuff I like!!!! bookshelves would be nice, I'd want to have a nice area to read/draw/write... and maybe a small table by a window to eat/have tea at! I'm also not a fan of carpet floors BUT carpets are cool... wood floors for ease of cleaning... It's hard for me to visualize something in detail though hhhh..... never really had a lot of space to work with!