Did you know that Turris Omnia has 12 adjustable RGB LEDs?

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JUST KIDDING, You all know that but wanted to share this cool Gif

However, just in case, all of them are fully programmable: set any color, brightness, flashing interval or turn ‘em off at night!

Useful also in “Factory Reset”:
https://docs.turris.cz/hw/omnia/rescue-modes/

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…and if You can use some shell scripting, the sky is the limit. Rainbow , or Knight Rider are here.