Created attachment 64737 [details]
Mockup of desired look
With 3.6, on Windows Vista, toolbars docked to the top were made grey instead of blue as before.
The change is not consistent yet, though, as toolbars docked to the sides or the bottom as well as undocked toolbars still use blue gradients.
Find attached a mock-up of how the desired look.
*** This bug has been marked as a duplicate of bug 51620 ***