What you do is split into 2 teams - one team are dishes, the others are bowls.
The markers are placed around the room, half the right way up, other half upside down. The goal of the team is to turn all of the markers the way they want it.
The winners are the team with the most markers facing the way they want them after a certain time. This game is really good for lots or little numbers of people and can be renamed to suit your theme for the evening (mountains and valleys, stars and black holes, apples and pears... whatever!)