I feel like I'm in a minority. After talking to many different users of Linux spanning across many distros, looking at "Post your Desktop" threads on forums, and looking at custom GTK/KDE themes, I have one question:
What's up with a lot of Linux users intentionally having, and wanting bad, old-looking GUI's? Many of them love old, simplistic, text-based GUI's with as minimal icons. On the other hand, you get really tacky "sleek" black and red, or black and blue themes. Hell, even the monochromatic ones are worse. I'm beginning to be under the impression that many Linux users want their desktop that way to intentionally appear like an experienced user who doesn't need a flashy GUI.
Having a good-looking interface won't mean your computer will slow down. This is 2010.