Heheh I bet we're all gonna say generally the same thing.

Medium sized room, carpet, nice furry rugs and such, a couple bean bag chairs, lazy boy, one of those beds that turns into a couch (not the other way around),
A perfect custom pc setup with sourround sound stereo for music/videogames,
a nice big tv close to the ground, A few windows but complete control over the indoor lighting, even to the extent of pitch black.
A locked shelf for all the peices, also with a bunch of candles on top and a poster of marley.
The ceiling covered with strategically placed black light posters and a black light alternative lighting setup.
Mini fridge and dry foods sitting in front of a hidden closet, which houses a small 2 or 3 plant sog chamber, shroom grow chamber, and a humongous hooka.
And I want to rig up some kind of secret compartment in the lazyboy chair for a couple oz's/other.
Air purifier, right outside the grow closet.
And assuming I do accomplish my dream of learning the violin, I'd like a coffee table against a wall near the lazyboy, with an amp and a violin underneath the table.
And on one of the walls I want to have very professional psychedelic art, VERY professional, to the extent that you need to get a foot from the wall to see the incredible detail, all properly designed on a larger scale to make your eyes trip out...

I'd also like this room to on a second story of a house, far away from anybody else's living quarters. Preferably a balcony as well, with a hammock.
On the balcony I'd like to tend to a mini-garden consisting of some san pedro cactus, s. divinorum, hbwoodrose, and maybe some lowriders.

I'd like to be able to see the road/driveway from the balcony, as I plan to deal a little and obviously have the aforementioned illegalities...
And you know what would be Really cool would be to have one of those ziplines from the balcony to my car. Heheh.

That was fun. I'd like to see someone top that.