I have compiled and installed compiz, emerald, some other packages which seem to be connected with compiz, but when i start compiz --replace, nothing happens and windows don't show anything and have no decorations until i press Ctrl+C.
What do i have to install to make compiz at least show decorations and update windows contents? And then, to make some compositing magic (cube, etc.)?

You have to be a bit more specific. What distribution are you working with (your profile lists three), what packages have you installed, how exactly do you start it etc...

LFS
Well, since i installed compiz 0.6.2 no new installed package changed compiz's behavior, so i should have installed nothing what is needed to make it work.
compiz --replace

I also tried to start it in separate X server from xterm, and what i see is white window of xterm (now xterm window does update - it didn't before X update) and black background after compiz startup and until Ctrl+C (before startup - normal xterm and default black&white background pattern). If i press Ctrl+Alt+F7 to change to first X server, it doesn't work. In fact, both servers crash, so i have to login via ssh and restart one.
If i start
compiz --replace --bg-image some_image.png
it doesn't draw this image on background - just black.

OK. I found the reason of compiz not working. I had to start compiz this way:
This would make it use configuration (via CCP) including plugins.
And then i had to issue
or
to spawn window decorations. That's all there is to it.

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