I have never decorated before, really never there for a holiday, but I have seen rooms decorated by people especailly around Christmas.
We were at the POR and there was a room with a string of lights around the inside of thier window as wellas a little tree they bought to put in the front window as well that was all decorated.
I think you should go for it! Get some pumpkin or bat litghts to hang in the window. Maybe stick a jack-o-lantern in the window to light up. (Fake of coarse) and maybe some cut outs in the window as well of ghosts!