I've used Red Dot, but it's been a long time, so I found this 'refresher' course by Christine Little very useful, and well-written! It's the second article on her blog, right after the amazing Rose of Thorns Compass Rose pictures. One hooked by Christine, and the gorgeous brown and gold version hooked by Vera Sollows. I've always wanted to do a Celtic knot rug, but I can't even imagine how to do this one. And they make it look easy!