Today I spent many hours trying to match a 2" square of wool. That has made me tired.
I think I've got it but it was a wandering and they are very difficult to match due the the layers they develop and how the colours interplay.
I've found a splendid web site on colour and its interaction, so important for us to study because all rug hooking is about is colour and you ! After you learn to pull a loop you are pretty much done with technique.
Here is a rug I'm working on as I study light and dark and it's effects. I'm at the edge of a dark wood looking out into a bright lake. As usual, it's symbolic too.