Character 'avatar' change? : World of Warcraft General Discussions

I don't really know what to call it, but I've heard of being able to change your character so it will show you as a diffrent 'model' but only to you and no one else. So say if you were a human race and wanted to look like a blood elf.. only you would see it, just for fun.

Is this possible? Thanks.

World of Warcraft Model Viewer.