Cold cathode is the technology and type of lighting, UV is a "color". Cold cathodes come in all different colors, red, green, blue... UV isn't really a color (it's a higer frequency part of the EM spectrum that humans can't really "see"), but don't worry about all that. You can get UV fans, dye for watercooling, just about anything these days. I have most of that stuff, and in my opinion it looks much much better than the crappy colored ones. Ordering a UV cold cathode is the same as ordering a red or green or blue cold cathode only UV is, we'll say, a differnt color.
A good site for custom stuff is xoxide.com
Hope this helps,
Chris