The title and description says it all. You can post it in sections, or just one part of your room, doesn't matter.
Here's mine, in several pictures:
There's my lovely, big ass fan with koi fish on it
I decorate my walls with collages and pictures that I like or that my friends draw for me
Some posters of my fave bands and my tv (currently watching Deadliest Warrior :D)
I also have glow-in-the-dark stars all over my walls and ceiling :)
And, of course, my pugs and awesome pillows complete the room