MrTheme, if I can give just a few thoughts...
1. make a header just a little bit smaller ( kill me, I dont know why, but its just my personall opinion)
2. maybe one more color: light silver (something like it is now)
3. maybe some more pastel colors, they are softer to eyes (I dont think people like this purple one which you provided, I know its just an example)http://www.specialtyfonts.com/colors/easter.htm
4. I like transparent piece of border
5. so far blue is my favourite one (as always), maybe just a little bit lighter? ;]
6. keep it as simple as possible, really
7. good job, maybe it is going to be iCMS next admin design