Unity 2d swap out background image

//You can create a sprite and swap which sprite it is using currently.
//these can be set in editor
public GameObject sprite1;
public GameObject sprite2;

//put following code in function that changes sprites
//this sets both of these to be the opposite of their current state
//SetActive() will set the game object before it to the active state of the
//bool in the parameters.
//activeSelf returns the active state of the given game object
sprite1.SetActive(!sprite.activeSelf);
sprite2.SetActive(!sprite.activeSelf);

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