God rays effect
Cast rays of light from the top of the screen. This won't work well if shown on top of the background color of the scene. Be sure to use an object acting as a background or a floor.

Use the Center X and Center Y properties to choose where the rays come from. Enable Parallel to make the rays travel in the same direction (like distant sunlight) instead of spreading out from that point. The rays are animated: set the Animation speed to 0 to freeze them.
Reference
All effects are listed in the effects reference page.