Rat tail?

Hello everyone!

I've seen pictures of really good rat tails, some with rings and some just smooth. I'd kind of like a tail with soft ring segments; what is the best pattern to use for this? I can't wrap my mind around it.

Doodles are great if anyone has one.

Thanks! :D

Edit: If anyone has a general rat tail pattern that would be neat. Sorry I wasn't so clear! ^^;