VIA Arena posted a howto on braiding the cables of a power supply.
One of the things that still drives me nuts about PCs is cabling. I hate messy cables. I've covered making cables neat several times in different articles over the years but I recently had a friend ask me how he could neaten up his power supply (PSU) cables. He wanted it to look professional. He already had a 400 watt PSU that was good quality and he didn't want to have to buy a new one with braided cables. The solution: braid the cables yourself. Braiding is essentially a material tube that sits over a groups of wires, affixed with shrink wrap at each end to hold it secure. A PCIe cable has six wires; a Serial ATA (SATA) cable has five wires; and a standard power connector, floppy and four pin plugs all have four wires. Braided cables make a PC much easier to work on since they bring all of those sets of wires into their own neat braided sets. Braided cables also look great, so that the rest of your hardware can be shown off with greater advantage..