There's a few I like. But...I'll list colors that I like and please my eyes.
Blood red - Well, hey. I like horror (anime and manga, also Lovecraftian Horror), it's pretty. It can vary depending on the person in terms of true blood red.
Black - Since my eyes are sensitive to bright colors, black can go with lighter colors to help me read things better and improves my focus. So, no. No edgy reason. It was also worn by some Polish royalty during the Medieval Era, one to name is a queen that was crowned as King of Poland, that being Jadwiga.
Purple [Dark Purple, to be exact] - It's pretty, but...Fun but somewhat morbid fact about dark purple is that in some regions of Poland it's a funeral color, just like black is.
Grayish-cobalt blue - It's my eye color to the exact smallest detailing in some areas of my iris. I've been told my eyes are very pretty and unique with that blend of neither being gray or blue.
Emerald green - Used to like emeralds as a kid.
Amethyst - Amethysts are my second favourite gemstone, it's also the birth stone of those born in February
Goldenrod yellow - Reminds me of Goldenrod City in Pokemon, which is home to the Game Corner. The gen 2 Game Corner music in Goldenrod City is one of my favourite Pokemon OST tracks.
Lavender - The only pastel color I like. It's pretty, like actual Lavender flowers.
Kiwi lime - It's the accent color of my bedroom walls and it fits nicely among the birch wood and pale ashen light gray wall paneling in my room.
Orchid - It's a pretty shade, actual Orchids scare me-
This one specifically shade of blue that had corn in it's name that I forgot but it was on a Crayola crayon - It may come with bad memories of Primary school but...I always liked using it as a kid...Heh- Even as a kid I was specific about what colors I use.
Slate gray - Although it's not exactly gray, it has a more bluer tints to it than most grays, it can look really nice with a lot of things.
[Honorable mentions]
Bottle green - Despite not being exactly green or blue, it's still a nice color.
Forest green - My high school uniform was that color in some areas. (Blazer and main color of the tie), it's also a pretty color.
Crimson - Because Terraria Crimson...Nah, just kidding. Used to like it before blood red tbh.
Pine leave green - It's a perfect color to blend in with Forest green when doing any artsy things. And then again, my surname does relate to Pines...So...No. I will not say what it is. Because it's the Internet.