How does an alpha, dominate, pua outfit his room? When you bring an hb home and head to the bedroom you want it to look cool and causal.

basically what color are the walls, bedsheets etc
which furniture you have
What pictures/posters are hanging on the wall
and whatever else to make your room look cool.

A) If you got a girl in your house and you're headed to your bedroom, do you think she's gunna go "wait we can't do it your wallpaper clashes with your ceiling"? It's not that big of a deal mate
B) Look at hotels/motels (the good ones lol); they are perfect room models (their entire business depends on you liking their rooms, it should be a good example)

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To game at your best you have to be willing to do your worst.

Just create somewhere comfortable and tidy which reflects your interests and lifestyle as much as possible.

Specific colors etc are probably not that vital.

Not important at all. As long as it's clean, you're fine. I do prescribe slightly to the idea that it's nice to have a few touches of your personality and background around the whole house; I'm not talking teddy bears from when you were a kid, but I've got a big canvas photo frame of me and my uni mates from back in the day in one room, I've got my handcarved chess set that I got from the French Alps in another room (even though I don't play chess, it looks great and has got a load of good memories and stories around it), tankards I got from Oktoberfest in Munich, things like that. Things that are conversation starters but also let the girl know a little bit about you but in a way that is little by little and is almost like her discovering it rather than you just sitting there telling her about every aspect of your life.

Again, these are just touches and if you've already got a girl back to your room, they aren't going to make or break the deal. 'Alpha' is a confident mindset more than anything else; decorate your room in such a way that you like and you are comfortable with showing off.