By speakers you mean the cabinets or the drivers?
If you look at the FR gallery you'll see a wide variety of finishes and colors folks have done for their boxes. Lot of nice ones there.
If you mean full-range drivers, they are not all black either though black drivers do have a "pro" look...
Some Fostex drivers are ivory/white; some models are charcoal grey
Lowther and Feastrex (seen pictures only) are white
Mark Audio has a wide range:
- Metal cones: Copper, gold, titanium grey, white (MAOP cones)
- Paper cones: Light blue, beige, and black