[simplyesl]

I always aim to get myself out of the picture as soon as I can to get the sts interacting comfortably with each and the language. There are definitely plenty of st-st drills you can do. I use drills as the bread and butter st-st interaction.... then I add some meat. I use all sorts of activities, depending on what kind a mood I'm in, the language and the ability of the students. Like you said, team work and role plays. Games, task based activities. Anything that you can think of that they sts enjoy and gets the teacher out of the picture as much as possible.
I do like playing games with my sts though and I think that the sts respond well when the teacher is 'being one of the sts' (I often take a sts seat and tell them to set-up a game or activity/explain the language. Oh, I also deliberately get answers wrong).