Ok so heres a TUT on how to change colors of features of the DotNetBar UI customization for Windows Forms.
To change the Button Colors:
Go to Color Table: And select the type you want
Orange with Background means that the button will be glassy, then when you hover over it then it will appear orange glassy.
So say i chose Magenta with Background. Result:
Without Hover:

With Hover:
To change the RibbonControl Color: Click on the RibbonControl, and go to the Style and Color:
Say i Chose Office 2007 as the Style and the Colour as Black. Result:

Credits go to NextGen1 for providing DotNetBar in his sig
Hope i helped. Press Thanks if i did!!