For odd reasons I like a very specific shade of green (around 525nm, I'd call it "emerald") - it shows a lot of promise in reducing migraine headaches. It's an example of what's called photobiomodulation, which is a technical term for using low-energy infrared/visible light to signal your body to do certain things (as opposed to harmful high-energy radiation like UV rays). Being in green spaces can also help people's mental health and that's still being investigated.

Another example is using red light therapy to help wounds heal faster and improve skin quality. Red or infrared light exposure for therapeutic reasons was investigated by NASA and adopted by the US Navy.

So it's probably different reasons than you were expecting in a longer answer, but I love those colors because they heal people :)

Jeans

arch linux

All the people providing very specific and complex answers and meanwhile I'm over here like

Octarine

Ultraviolet. It makes other colors look cool. And it kills stuff.

Purple.

Well the thing about that is, well, what is color? Is it, as Sam Harris would say, the way light reflects off an object and reacts in the eye, or is it something more? Y'know Carl Jung put forth that color represent- ed more than a spectrum of light but a representation of one's inner character, roughly speaking. So is it enough to have a favorite color, or should the right question be "what is the color that best represents your personality?" Your big five personality more specifically. When people ask me this question, as they inevitably do, I can't help but think "you absolute son of a bitch". To think that our desire for simple answers can lead us to be so arrogrant is absurd. Just look at the Bible for God's sake. In the Bible, I can't remember exactly where at the moment, it is said that the heavens are as a paved work of sapphire stone. So Heaven is seen as blue, as it's often thought of to be in the sky as well. I mean obviously! So maybe the answer should be blue, not just for me but for all of us. Because Heaven is when the balance of chaos and order are set in perfect order. That's the idea. But then why do we use blue as a metaphor for sadness? Well that brings up another interesting point that Foucault struggled with. He said that...

#FF00FF

Orange. Pure orange, yellow orange, neon, burnt. Not so much red-orange, but I do love oranges that have a bit of a pink sheen, like padparadscha sapphires.

Deep royal purple

Think Joker’s suit in the Arkham games

Nice try fed won't narrow me down that easily

#079182

I only see in the radio spectrum, but 1420 MHz is quite tranquil.

Hot pink because it is girly, yet aggressive.

Specifically hex B5A9FC

Cyan. Not just blue but cyan. Slightly neon, not sky blue pastel.

Especially if paired with black, it pops.

Pink, and it sucks that everything pink is more expensive. Specifically, I like pastel pinks, like baby pink.

Yellow! I used to hate it but after I started playing Splatoon it really grew on me and now it is my preferred color of choice

Orange. And when my students would ask why, I would tell them that it’s a bright color like red, but red is an angry color - stop, fire, mad emoji. Orange is a happy red!

Purple.

I like dark blue and purple equally.

Non-blue grey. A lot of greys will have a blue tint. I like grey that doesn't have that blue tint. I like it because it's a neutral color that's easy to match bright colors to, but it doesn't feel dated like beige. If I had to pick a specific shade, I'd pick 50% grey, but I like a lot of greys.

I don't have a favorite color. I guess I have a preference for certain colors in certain places, but I like them all.

White, because it can be "Any colour you like"

640,000GHz is nice

Dark green, mustard yellow, purple and whatever this is called:

And colors that give me nostalgia like traffic light yellow or a specific shade of light blue.

Brown.

It’s coffee, it’s meat, it’s wood, it’s orange, but darker.

#666633 - Dark Olive Green