What effects the best with the various tools?

Guys, where can I get a rain effect? Just really need. With it perfectly combines the sound of the piano

You can create your own by filtering pink noise a certain way --I would just use your ear, or maybe even Google a tutorial on it (it may be out there, who knows). Otherwise you may be able to find some royalty free rain sounds somewhere. I personally haven't used rain in any tracks so I don't know where to get them. I'll let you know if I come across it.

You mean that you want to combine a synthesized rain effect with a piano sound?
You could try what Erick said. Even though I guess it would sound more like a noisy piano sound, or I don't get what you mean.
Or do you mean a "musical sound voice that has 'rain' characteristics"?
Then you could try to program such a sound with another synthesizer, and use the midi-track of the piano for that synthesizer as well.

If you mean "real rain recordings" (?), just browse for beautifully recorded rain recordings in my portfolio and that of my fellow recordists. ;)
You can find lots of these also by performing a search in the SFX section.

There are also sites with free sound effects done by enthusiasts, but they are mostly done by beginners. At least whenever I looked there in the past, most recordings were pretty noisy, off-axis etc.
Maybe this has changed by now, but I doubt it.

filmsound,
I actually do want to get into doing field recording myself. So would the best kind of mic to have be a stereo mic? Or a Ribbon Mic? (although it seems that a Ribbon mic would be stereo or surround automatically, if I understand the mechanics of it).
Thanks for the info in your above post.

I never been good with recreating sounds but i heard some extremely good ambient/live sound in Absynth 5,most advanced synth in the world.

Guys thanks for all the advice!