If you mean colours of hi-fi equipment, yes.
Back in the days of my seperates systems I not only preferred everything the same colour but the same shape and same brand wherever possible.
For 11 years I had a Rega amp and Rega tuner and they looked great together on adjacent shelves. But the Yamaha cassette recorder - despite being roughly the same colour - stuck out like a sore thumb and made me wish at times that I'd bought all Yamaha kit. Luckily it was an excellent cassette recorder and it was somewhat less visible than the Rega kit ( sitting in a shelf underneath them).
As far as speakers are concerned, they have to be available in Maple or Beech or light/natural Oak to match the bookshelves and the unit the Marantz and TV sit on. It also bugs me that the Humax and BD player are black, but extraneous/peripheral boxes have always bugged me and are largely unavoidable. At least they are smaller and better looking than the old VHS and cassette recorders of years ago.