This is why I love Linux/Opensource
Jeremy was playing around on ShinyCat trying to get Compiz installed for some nifty orange glows around his windows. Well, ShinyCat has crappy integrated ATI drivers and we couldn't get any of the drivers properly installed so Compiz kept giving stupid errors. He was kind of bothered that we couldn't get this to work, so jokingly I said "The xfce compositor does shadows, just change the color in the source code."
That joke turned into the project for the next ten minutes which included hunting down the XFCE Window Manager source code and finding where in said code the color for the shadow was defined. Jeremy now has orange "glows" around his windows and pop up menus without the bloat and resource eating that Compiz would bring to ShinyCat.
It was fun.
On the todo list for the window manager is "selectable shadow colors." I'm pretty sure I could patch it so that it accepts arguments from the command line for colors, but I wouldn't quite know how to bring it into the GUI (though maybe I should attempt that over break? If it's still on the todo list (which is only a couple of months old?), that possibly means that someone hasn't submitted a patch to implement such a thing yet?).
The changelog for the latest 4.6 beta (current stable release is 4.4.3) says that they've implemented changing the opacity value but not color yet. =P

Before (on white):

After (on black):
