The colors can't be set normally. But you are able to edit the color with the help of the registry editor.
Please allow me to note, that you must changed more than one color, each button, window frame, bar and so on has its own color in RGB Value.
R-G-B = Red-Green-Blue => 255-255-255 is white for instance. So find out which color you must change within your registry and do not forget to save your original color values !
If you have no idea, what I'm talking about, just forget it...
Otherwise...
Start your Registry Editor
Search here...
[HKEY_CURRENT_USER\Control Panel\Colors]
Edit these colors...
"ButtonFace"="194 198 210"
"Menu"="194 198 210"
"MenuBar"="194 198 210"
Reboot...
Voila... your color within the program now should like the attached screenshot which I've made from my poposhop CS5
Finito la muzika... :-)
STORMLORD