About a month ago I re-learned how to draw knots. Here are the ones I've done at my house (there are a few others that I did during various staff meetings that I'm not going to dig out of my work stuff).
Click on them to see them bigger.
They appear in the order in which I drew them.
This last one is for my friend, Bill, who LOVES dragons.
My favorites are the ferret biting it's own tail and the vine.