I don't always know what will happen in the studio, but sometimes it just all comes together. We don't always do repeatable colours, I find I have more fun and enjoy dyeing when I don't have a plan. There's no pressure and you don't have to worry about anyone being disappointed because it didn't look like the last one you dyed.
Don't get me wrong, it doesn't always work out. We've had some of yarn end up in the purple dye pot to be over-dyed because we weren't happy with it. And really, who doesn't like purple socks?