Gryffindor:
Feel low if their walls aren't painted their favourite color, no colour scheme but it looks fun, posters of their favourite bands on the walls, the original floordrobe pioneers, messy, but unlike Ravenclaw they don't know where their stuff is.

Ravenclaw:
They have their CDs arranged in alphabetical order, books are ordered by colour, they like to have their favourite films on display, probably looks like chaos, but they know where everything is, definitely have had glow-in-the-dark stars on their ceiling at some point.

Hufflepuff:
The plant thing is kinda true, they need pictures of their friends and family, a corkboard with memories of good days, photographs, tickets, lots of knick-knacks on every surface, they need plenty of blankets and pillows to make it cosy.

Slytherin:
Their room is their sanctuary, black-out curtains, candles for aesthetic but probably never light them, probably have some semi-precious stones somewhere, still have their childhood stuffed toys