Even then, there should be a limit. 3 months was mentioned earlier, and while I'm cool with it, I'm still more a fan of half a year. Constantly changing stuff gets confusing, as we've seen in this thread. While changing your avatar and signature is fine (akin to changing clothes in real life), changing your name shouldn't be done trivially (again, as in real life), as this is what people know you by. More than your avi or siggy, this is your identity. As such, changing it willy nilly tends to cause problems.