This game is just like normal volleyball, but each team is given a blanket.
The team should stand around the edge of the blanket, stretching it out so it is tight. The 'serving' team should start by placing the ball on the blanket, loosening then brining it tight so it 'throws' the ball over the net. The other team then use their blanket to catch the ball then throw it back.
It's an interesting and fun variation to a game we're all familiar with.