I can't tell if this is an actual subject question or not, so I'll try.
You can put posters of old videos games or music. You can put polaroids on your walls. Paint your walls a color OTHER than white (if you want). A bookshelf with a flower pot would be nice. :)
Of course, this is all just preference !! You do you.
Kindly mark me as brainliest if this helped at all.
