Unlike most games, World of Warcraft provides a wide range of options for reducing the graphical complexity of the game to make sure that it runs on pretty much any system. This is undoubtedly one of the reasons for its phenomenal success, but it also means that those of us with powerful rigs are left wanting more. The good news is that there are a number of hidden settings that allow you to go beyond what you can do using the regular WoW interface.
To access these hidden settings you simply need to type commands (listed below, right in 'Get hidden settings') one at a time into your chat box and hit [Enter] - the moment you hit a '/' you'll start typing them in. Some people have found that reloading the UI (type / 'console reloadui') makes things prettier, although we haven't noticed this ourselves. Either way, it gives you control over rendering values that isn't possible using the slider systems alone.
You can enter these settings manually just to see what difference they make, but it's probably wiser to create a couple of macros that can change the settings on the fly. There are times when you'll need performance (in a raid, for example), and others when you just need the game to look as good as humanly possible (soloing). Once you have the settings as macros you can tailor them easily to suit your own needs, and just hit the buttons when needed. Beautiful.
How to make WoW gorgeous
You have plenty of control over WoW using the default video settings, which can be accessed from the main menu, but the limits of these sliders are lower than what the game is actually capable of (1). For instance, the Ground Clutter Density slider has an in-game maximum setting of 160, but the corresponding console command lets you push this all the way up to 256. The difference is pretty breathtaking too - with not only more vegetation, but higher and more lush plants at that (2). It also makes more stones, but that doesn't excite us quite so much.