A simple effect that imitates rays of light on a 2D surface. Note that it's not projecting any real light that interacts with objects or casts shadows - it's just an animated texture based on Perlin noise shader.
It can be pretty useful for adding some atmospheric effects to 2D games. It's lightweight and works great on mobile devices.
To create new LightRays 2D object in your scene, click on GameObject menu in Unity window, then go to Effects and then click LightRays2D.
That's it, now you have a quad with LightRays tecture on it. Now you can resize it, set the colors and adjust the sliders untill you achieve the desired effect.