It is only the appearance of choice,....although.....
I remember one KH that was in an all-black area. The Regional Comm (made up I believe entirely of whites) sent them 3 or 4 color packages (carpet, paint, tile, wallpaper (wallpaper now all but eliminated))...the brothers in the all-black congo wrote a very humble, sweet letter that essentially said "Dear brothers, we truly appreciate the hard work you put into picking these choices, but to be honest, those colors are just bland, they are just not 'us'".... The congo ended up choosing a color scheme that I (as a white person) would describe as very loud...as in Easter Sunday/Orange LOUD...but when it all came together, it was actually OK...almost nice.... (still not my choice, but I did not attend there).
Nowadays, the Borg, through the Regionals, try to control absolutely every aspect of construction/decoration. I know if the local congo uses society funds (aka "loan")...they have to kowtow to the regional. I am not even sure if local congos are allowed to build a KH outside of the Borg/Regional control. If Regional is involved at all, Borg has final say. In fact, if a congo uses even 1 brother or sister from a congo not at that KH (or KH complex in multi-auditorium KHs), then they have to go through Regional Volunteer Service (which I was involved in).
I was not on the Regional Committee as an elder, but I was pretty close to many of them and the key men. It was all about staying to the set plans, set colors, etc....choices are really made before they get to the locals... so the vote is between blah and really blah ....so sad...all in the name of "keeping it simple so we can get back to the all important Ministry Sales Force" ... I did serve as Local Building Committee Chairman for our remodel, but I drug my heels because our congo could not afford what they were wanting to do and they were not prepared for the workload. (small body of elders, lazy MS's) Once I was booted off as an elder, they started moving ahead with their fancier and more costly plans (with a sudden infusion of cash from a sister who died...left money to our KH AND 2 other KHs....but the SO of our KH was also Executor of her estate....talk about wolf guarding the henhouse...hmmm...suddenly no money for the other 2 poorer KHs.... suddenly their needs AND wants could be had....at the expense of the others....although I hear there is yet another delay..... selfish bastards....
SnakesInTheTower (of the "who cares what color the fu*k*ng KH is" Sheep Class)