This isn't anywhere near a complete GUI, but I figure someone may find it handy anyway.  It's sort of a modern take on the old Final Fantasy style blue box with a white border.

Contains transparent PNG and original SVG source image.  Created in Inkscape, which is the most awesome vector editor ever. :)

I may update this later.

Note:  When you credit me, you must incude a link to http://opengameart.org .