The folks at TweakTown say that the Corsair Premium Individually Sleeved PSU cable kit is a fantastic way to spruce up the looks of your system without spending a lot of money.
While many case manufacturers have kits on offer, and many companies for accessories have made their sets as well, it only makes sense that if you do not have the time or desire to sleeve your PSU wires, it makes the most sense to get your cables from the same people who make your PSU.