Apple

An OS maker (among other things) whose GUI seems to give half the Windows computing world orgasms. Go onto any major skinning site (deviantART being a particularly nasty example), and search for "most popular" Visual Styles or the equivalent. Instead of getting lots of innovative and interesting themes, you are flooded with countless versions of things with names like "Milk," "Aqua," and "Brushed Metal." They aren't that amazing looking. Also annoying are the various Dock apps. The Dock has little use other than to look pretty and eat CPU. If you really must be lazy in your skinning, just go buy a darn iMac and let the rest of us skin creatively.