I think the word for the "splotchy" CF is "prepeg". essentially, the fibers are on a big spool (think of a loom for fabric, lots of strands running parallel) and they go through an assembly line type of process where resin is applied, then dried, and rolled into big rolls, generally kept frozen so that the resin doesn't cure. the manufacturer then just takes the sheets from the rolls, thaws them, then uses a heat gun type of device to cure the resin fully. there was a good picture of the process in my materials textbook, if I still had it I'd scan it.

The result is not a pretty carbon weave. instead, you get an ugly looking finish. generally, when you see that weave, it is not structural, it is there to look pretty and have a nice CF appearance. I suppose the "nude carbon" is just missing the cosmetic layer of "weave".