Sunday School

I am considering doing something different with our current Sunday School layout. We are currently pretty traditional. How are you're services laid out? Any ideas or thoughts are welcome.
I am about to start another class for the smaller children 1-5, and then having children's church at our normal worship service time, utilyzing and rotating some of our young people to handle it in another small building (trying not to kill our service attendance and worship). We already have a youth class in a room and 1st - 4th grade class in a room, and our adult class in the sanctuary. We don't have any more rooms to utylize but i need to do something with our adult SS class. I am wondering what some of you do in your adult SS class.