In Windows Vista, Microsoft has introduced new Explorer UI includes Navigation Pane, Forward & Backward buttons, Toolbars, Address bar, Search box, Detail pane etc…
Here is simple and straight guide to customize shell style…that helps to change colors of Toolbar and Detail pane.

Requires:
Resource Editor: Resource Hacker
Text Editor: my favorite Notepad
How to:
Extract a text file from shellstyle.dll, open the file in ResHacker

Changing Toolbar color
Open the text file (1.txt) in Notepad and search for string
Gradient(argb(255,4,80,130),argb(255,17,101,132),argb(255,29,121,134),3)
Actual color code for Toolbar - its gradient color, combination of three colors.
Search occurrence will be two times…
Explanation
argb(X,R,G,B )
Where X ->Transparency, R -> Red, G -> Green, B -> Blue
background="Gradient(argb(255,R1,G1,B1),argb(255,R2,G2,B2),argb(255,R3,G3,B3),3)"
Replace the code with desired one. I have replaced with this.
Gradient(argb(255,15,55,107),argb(255,50,110,210),argb(255,15,55,107),3)
Full Article: MeraWindows.Com