var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create });

var emitter;

function preload() {

    game.load.image('carrot', 'assets/sprites/carrot.png');
    game.load.image('star', 'assets/misc/star_particle.png');
    game.load.image('diamond', 'assets/sprites/diamond.png');

}

function create() {

    game.stage.backgroundColor = 0x337799;

    emitter = game.add.emitter(game.world.centerX, 200, 200);

    //  Here we're passing an array of image keys. It will pick one at random when emitting a new particle.
    emitter.makeParticles(['diamond', 'carrot', 'star']);

    emitter.start(false, 5000, 20);

}