Alright so I've been using these for quite some time but only recently realized I don't actually know how they were made. I can't seem to track them down to a specific file, as they're usually just copy pasted across. It's a Boolean Control that seems to be made up completely of decorations, but these decorations act as a single object. When the state changes, the entire decoration object changes it's color. It's not an image either, as you can right click->properties to change the color of true and false and it changes what the decorations object uses. I've been able to somewhat replicate it by replacing the light part of a boolean control with a decoration, but I can't seem to make multiple decorations be counted as a single copy to import onto the control. Any ideas what they did?
True:
False