Not sure if this has been implemented before or not, I know it has been talked about, but over the past three days I've thrown together a hacked up backend for GNUstep running through DirectFB. It is definitely not perfect or usable at this point, but with just a little bit more effort this will be solid. Just wanted to announce that on here in case anyone was interested.
Here are a few screenshots. Obviously there are rendering issues. The one seen here is the color issue. There's another where it seems the image data is being rendered a pixel or two skinnier than the window, thus cacading the interface to the left one pixel on every line... soon to be fixed.