Phaser Background

//in the game's preload function you load the image like any other
game.load.image('bkgrnd', 'sprites/background.png');

/*Then you add the tileSprite in create(). This constructor's parameters are, in order:
   0 - position of the image on the X coordinate of the game
   0 - position of the image on the Y coordinate of the game
   640 - Width of the tile
   480 - Height of the tile
   bkgrnd - key you gave to the image when you loaded it in preload() 
  see: http://phaser.io/docs/2.4.4/Phaser.TileSprite.html */
game.add.tileSprite(0, 0, 640, 480, 'bkgrnd');

using a tileSprite to act as a background in a Phaser game.