Here is a look at some billiards rooms I found on Houzz.com. I think they are a must in a mansion. My dream home would most definitely have one. As you can see, there is an array of different styles you can go for. You can have an ultra modern one or a rustic one. I personally would go for a more rustic one with paneled walls like #2. Which one is YOUR favorite? Enjoy!
A Look At Some Billiards Rooms From Houzz.com