Some links to Celtic knots that Kellie G. provided:
'I was reading the link that you posted about "why knot art" and I just wanted to tell you that the links entitled "wood carving" and "twist a band" are beautiful. I especially like the twist a band. I just wanted you to check out some of the celtic knots and symbols-they are very similar. This site has some knots with the grids used to attain them.'