Pick about 4 people to be 'taggers'.
Then set boundaries (you want an open space ie: school gym).
Then someone calls out a color (everyone wearing red for example) and then everyone wearing that color (or can do patterns, ie: stripes, plaid etc) has to run across. If they are tagged, they sit out.
If the caller calls out: "color tag" then everyone runs.
If the caller calls out "energizer" then everyone sitting out can rejoin in the game.