When you enter full-screen mode in an application you get a message saying that you can leave the full-screen mode via the esc-key. That ok but the design of this message is just ugly and very disturbing. The letters are too big and the blue color is very disturbing. If you can't make this styleable, you should at least not use any colors in this message because this will most certainly interfere with the application style. A half transparent black and white color scheme would be more appropriate. Just look at how Adobe does it in flash player.