For those who want rounded cables, but don't want to have the sometimes reduced performance of them, go check out the Icronic site. They have just posted a review of the Wire Loom Kit for your reading pleasure. here's a snip:

"What in blazes is wire loom you ask? it's faux chrome finish plastic cable or wire casing to slick up the inside of your PC. Some people prefer rounded cables and some prefer wraps of different colours. Now there's another choice to give the wiring of your PC a shiny chrome appearance. One of the best things is that these "looms" from AMK Computers are non-conductive so you won't have to worry about shorting out your system accidentally."