Okay so in my room I have 2 MC posters (18"*24") (one tall one short. A MC framed canvas poster that says keep calm and never dig straight down, A MC calendar, mc sheets (and pillowscases) mc twin/full bed comforter (double sided and a MC dirty clothes hamper, and a Redstone lamp light (many types I have the Redstone lamp one), mc curtains (they're thin tho so ur parents may need to add a fabric behind it), A MC puzzle that my family will eventually do and after we do it mom/dad will glue it together and put it on a poster board and hang my wall.. Along with mini MC trinkets (fugurines, Mini lights, etcetera). There's more I'm forgetting probably but I'm too lazy to type it. Oh I have a bunch of MC books stored in my room.
I have seen custom MC posters online (I personally don't have one. :C)
On the outside of my room attached to the door I have a sign that looks like a MC sign that says bedroom.
I also have a bunch of small MC posters (although not hung up).
I also have a,framed MC picture (I've had the frame as far as I can remember) you print out the image you want to be in it and there you go.
I don't have them but MC throw-pillows
And I think that's about it that I have/that I can think of that's MC room decor
There are tons of MC poster options tho. So.... Don't feel restricted to get how many I have.
Tell me if you want more ideas.
Bye for now
(Yes I have a MC pretty much everything there is a MC version of.)