But when I look at websites, many of them go out of their way to have them make "unique", instead of just using defaults.
I think one big reason for that is that, with websites, it isn't so far "out of their way" as it is with GUI toolkits. It's relatively easy to significantly spice up a web page. Moreover, it's easy enough that a designer can design a website without interacting much at all with the programmers.
Really, I think the abberation is the slew of programs that adhere to the (usually drab) defaults. Unlike windows programs, Java programs, and Tk programs, most human creations are distintively styled. Publications included. Consider the variations in books... cups... doors... If programmers made all the furniture in the world, would we all sit down to eat our dinners at gray card tables with matching folding chairs?
I think GUIs will need to mature a great deal before consistent and intuitive interfaces that don't suck aesthetically will become commonplace. Of course, by then, the "intuitive" requirement will take on a whole different meaning by virtue of the fact that most people will be exposed to computing from a very early age.
"My two cents aren't worth a dime.";