I was watching some Photoshop tutorials here at work and used my deviation "It's Coming" to try a rain effect... and apparently a night effect as well. Thought I'd show it to y'all to oogle and groan at. I'll probably scrap it in a while.
Well I like the effect. And to my eyes it looks realistic - maybe you'd have to make the colour a bit of a deeper blue, but apart from that, it looks like a real photo to me.