I like it when someone has to do one mistake and people get mad LOL
you can put the id like this {c:1234567|random save}
JonaHungary, every single LCD display that has color consists of Red, Green and Blue pixels, thus R.G.B.
Some tips: 1. Write down {c:2434114|Check this save} in the sign to make it clickable and direct to that save. 2. Switch the green and blue pixels around so you'll have more blue pixels than green or red to get a nicer black and to stop the glow of SWCH making many colours look green.
The thing is, all those "screens" are actually misnomers, this is only capable of displaying a single pixel. And the idea of mixing the glow of various switchable elements to produce mixed colors is so common that I wonder why people still keep coming up with it, as most should already know what it is and how it works.
It's not a bad save, and it's not a problem that this is not an orginal idea. The problem is that this is on FP.