Wires and lights are different. Green light means go (positive acceleration), red means stop (negative acceleration).
I kinda wanted @CTorp’s Switched Multiples to have an amber LED in between, but it’d be complicated making that work.
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I really don’t think traffic lights are any more relevant than electric wires in this context 
(I mean, the only thing moving here is electrons, and they’re moving forward when the voltage is negative, so with that notion shouldn’t green be −12V and red be 0 V? 
)
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Electrons don’t exist, don’t tell me you believe in them.
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I can settle this-just use a black LED. Don’t have one? You can make one very easily, all you need is any color of LED and 240v.
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It’s frogs all the way down.
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Does it dim the light in the room 
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tell me more. is it a red LED with tinted windows?
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clear red with black sharpie . funny it looks completely black when it is off and you can still see red when it is on , hhhhmmmm … 
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That is just genius!
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actually I was just being silly but it might look cool on the " black out " module set .
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Electrons, well, I believe in ‘angry pixies’! 
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This reminds me of a scene in Hitchhiker’s Guide to the Galaxy where they board a completely black spaceship. The interior colour scheme also turns out to be completely black. “Press one of these black buttons and it lights up black to let you know you’ve pressed it.”
The spaceship then starts to dive into the centre of a nearby star, but I forget what happens next.
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Use a security pen and a UV led to light up a written message, art or a symbol? Proper black light then. I just thought of this so no idea if it’s practical… but then I build music stuff and that is never a practical kind of endeavour. Have fun.
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The Electrons as everyone should know were enemies of Dan Dare.
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There are genuinely LED’s that emit Black Light 
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I used some dark nail polish to make the LEDs on one of my synths shine less brightly so that I could read the text next to the LEDs when they were lit.
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I’ve got some spare black leds if you need them! PM me 
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You mean DEADs - Dark Emitting Arsenide Diode?!
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Those are probably SBHs (small black holes). I could not find a footprint for those in KiCad or EasyEda though, last time I had a look.
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