How do you get text colors to have nice hex codes?

I'm writing an mspfa, and I'm trying to pick colors for dialog. I want the colors to have nice looking hex codes cause, ya know, Homestuck. I have no idea how tf to do that tho. I was messing around with a color pick and I don't get it. I know base 16 but that's about it. @sleepyfellow03 I know you have cool hex codes for your OCs. Is it just trail and error?