I currently have 9 bettas. 2 females, the rest are males, and of the males, 2 are plakats. I do not have a "fish room," but my kitchen has been transformed into one! It currently holds 7 five gallon tanks, 1 ten gallon tank, and 1 thirty gallon tank. The other two bettas are in my room in 2.5 gallon tanks until they are large/healthy enough to be moved into 5 gallon tanks.
My sister is moving out of the house in January, and her room is to become my new fish room/bedroom. My current bedroom is unofficially the "bird room," home to six birds, including 2 large parrots. I basically don't even have space for a desk anymore thanks to all of the aviaries, so I'm looking fowards to taking over my sis's room. I will be adding a 75gal tank (for the goldfish; the algae eater will be moving to thier 30gal), the 30 gal, and all but two of the betta tanks to this room. Exciting, huh?
I'll add pics later of our current kitchen-based "fish room."