My favorite One Tiny Thing swaps are the Harry Potter ones, so I decided to make a Harry Potter themed entry for this challenge. I made the boys' dormitory of Gryffindor Tower.
This is Harry, Ron, Neville, Seamus, and Dean's room from early in their fourth year. Dean has his new Viktor Krum poster and his West Ham football team poster up next to the door.
Close-up of the posters:
Like all teenage boys everywhere, the Gryffindor crew are not what you would call tidy. Seamus left a robe on the floor, Harry's broomstick is a tripping hazard, and Ron's trunk is open with his Weasley sweater spilling out.
I did my very best to make everything in the room to scale. I used 1 millimeter = 1 foot, because a millimeter is the smallest measurement on my ruler but I don't think in meters, I think in feet. The beds are 8mm high by 7mm long by 6mm wide (approximately) and the trunks are made from slices of matchsticks.
I made a tower for my room to sit in, since Harry's dorm is at the top. The entire tower is less than 4 inches high: