As you can see EDE supports themes and window decorations.

Each theme contains few XPM images and a text file called default.theme, which describes how the theme should look to the window manager. Here is an example default.theme file:

[Theme]
 Frame color=RGB(129,153,177)
 Title image=title.xpm
 Close image up=close.xpm
 Close image down=closeD.xpm
 Maximize image up=max.xpm
 Maximize image down=maxD.xpm
 Minimize image up=min.xpm
 Minimize image down=minD.xpm

Frame color describes the color that the left, right and bottom window frames use. If you ask yourself about the top frame, don't worry, The Title image variable will fill it.

RGB(129, 153, 177) describes the percent of red, green and blue color used respectively. So here we have red = 129, green = 153 and blue = 177. With the combination of these basic three colors you can get various color schemes.

Title image is ordinary XPM image that will be used to decorate window title. It will be tiled (remember this !).

Close image up will be used to decorate the close button (button placed on top-right window frame). This variable describes how the close button will look when it's not pressed.

Close image down same as above, except that this image will be used when the close button is pressed.

Maximize image up, Maximize image down, Minimize image up and Minimize image down, do the same for the other buttons like described for the Close button.