Try this:
1) Change the value of Fonts, Colors, & System Metrics > Colors (Globals) > COLORIZATIONCOLOR to -3355444
2) Change the values of COLORIZATIONCOLOR and COLORIZATIONOPACITY to zero at:
Windows & Caption Buttons > Aero > DWM Window > Frames > Window > Top > Active
Windows & Caption Buttons > Aero > DWM Window > Frames > Window > Top > Inactive
Windows & Caption Buttons > Aero > DWM Window > Frames > Window > Top > MaxActive
Windows & Caption Buttons > Aero > DWM Window > Frames > Window > Top > MaxInactive
3) In your .theme file add ColorizationColor=0xFFCCCCCC and change the value of Autocolorization to zero
As long as you keep using the same solid color (204,204,204) frame you show in your pictures.
If you change the color you'll have to change the values.
If you want to use a gradient or transparency you'll need this:
http://www.msfn.org/board/forum/180-aero-glass-for-windows-8/