Or if you parents allow you, how do you decorate your room or any room you are allowed to decorate?

I plan on theming each room. Most of them will be "regular" but I plan on Sonic theming my bedroom. I originally planned on Hello Kitty theming it, but that’s too feminine for me. At the moment my room is regular, with just gaming stuff.
I also plan on my game room (a room with an arcade machine and every video game console) being video game themed.

my fiance and i just bought our first house and we are both excited to remodel and decorate it…but we have totally different ideas…i told him he can decorate his game room however he wants and hes excited about that but he also wants to decorate the entire house however he wants and he really just doesnt have good taste and i would like everything to be neutral so that we can have a high resale value…..i guess i dont really have a question i just need advice….or if you can let me know magazines or websites with good ideas…..thanks!!!!