There are a few at tanglepatterns.com, and I chose insydout and itsytwisty. Itsytwisty is one I've been wanting to learn, and it IS a lot of fun.
As I played with it, I found there's an easy way to make the "ribbon" look really nice, but not until I was almost done with my piece.
So I thought I'd put a little tutorial here, to sort of show what I finally figured out.
Notice, I numbered the ends of each line 1 or 2.
when drawing the lines for the ribbons, go from 1 to 1, and then from 2 to 2. This causes the lines to naturally cross each other.
On the bottom, you do the same thing, on the alternating lines. Without the disc shapes there, it's easy to connect them on the bottom, but when you have the "buttons" in place, you have to sort of eyeball where the connections on the bottom would appear, but you still go from 1 to 1 and from 2 to 2.
So, that is how I did the last strand of itsytwisty in my piece.
And this is what I ended up with:
Insydout will be fun to play with some more, and I like insydout. It has potential for a lot of variety.