One day in practice we had an hour, half of which we wanted to devote to 6 v 6 game play. Here's the practice plan we developed.
There are a number of variations on winners (a.k.a. King/Queen of the court). I started using one that introduces more positional specialization.
While coaching at Svedala I got to see the Swedish version of 4 v 4 mini volleyball, which allows a bounce. I made some interesting observations.
This training session uses cooperative games to warm-up, then moves to small-sided competitive games. The main idea is to get lots of game-like touches.