That's my all-time favorite theme! On the one hand I love the simplicity of it, it's not overloaded like many other themes. On the other hand it's also not simple in the meaning of "ugly". All elements are styled very well and are nice to look at, like all that soft borders and rounded edges. And that fox logo spends just that one tick of color to give it some more "pep", while still not being too obtrusive. Great work!
Also, don't let anyone talk you into changing something about the scrollbars. They fit perfectly to the theme, and I wouldn't want them any different.