Figured out an easy way to make a basic looking rain effect...

I've seen a good bit of threads looking for a rain particle. I don't actually HAVE a rain effect, but I have figured out a way to create one, using the sparks particle effect included in Unity.

Basically, you create a picture of a horizontal white line going across a black background, and use that as the texture for the sparks effect. Then you set the sparks effect to blast over a wide area. Set the effect a little bit above the player camera. Then parent it to the camera. Now, go into game view and tweak with the settings until you get it how you want it.

I know this isn't clear, but I'm pressed for time. I tried to upload a web player demo, but for some reason it gives me an error. I'll try again tomorrow.