Perhaps this has been done, but I haven't seen it.... You can make a very cool combo button LED by doing the following
1) I'm most of you know this part, but.... Create a graphic file containing two side-by-side images of the same size. When this graphic is assigned to an LED, the left-hand image will be displayed when the LED is off, and the right-hand image will be displayed when the LED is on. If the LED is configured to blink, the display will toggle between the two images.
2) Create an LED using the above graphic, and overlay that with a graphic button, with the image file assigned to a transparent .png file with no color data - i.e. - a blank, but transparent, image. You now have a button that can have two completely different graphics depending on whether the corresponding variable is on or off.
The attached simple screen demonstrates this. The left-most button changes color when the corresponding variable is set. The middle button blinks in a different color when the corresponding variable is set. The right-most is a photo I took of one of the dashboard toggle switches on my '64 Jaguar E-Type.
Regards,
Ray L.