Wow, I like this a lot. Very clean look, but still a little playful with the muted colors. If I had to change anything I'd take another look at some of the icon caps. For most of them you used blue as the primary color and pink as the accent. But then for some it seems to be the other way around, for example tab, page up, page down, home and end.
Honestly it's a very minor complaint, just something I noticed.
Also I wish the arrow keys were also dual color.