If you use an uncolored teflon-insulated wire/cable, it's white. What I think would look really nice is to get, say some starquad of any color, strip off the PVC insulation around the four wires inside, but be careful not to remove the shield. Put small-diameter techflex over it, white or black will look really nice, and you'll be able to see some of the shield through the techflex.
That's what I've been doing on my cables lately -- actually I've just been using the foil shield that I get from old poorly-built cables or leftover starquad, with Belden 83005 (teflon insulated, silver-coated copper wire) used as the conductors. But overall it looks good, and I've been pretty happy with the sound.