Compiz Config Settings Manager. Under Desktop Cube, there's a tab for Transparant Cube, with an Opacity slider that you can use to set how transluscent or transparant you want your cube. Under Paint With Fire, it'll show the keybindings to start and stop the effect, as well as particle size, colour, or random colour fire settings. I don't have Snow, but if you click on it, it should bring up the settings page for the Snow plugin. Hope this helps.
"Dance without sleeping, I'll dance without fear
Dance without senses, no message I hear
Dance without feeling, I'll dance 'til I'm numb
Dance 'til I think I can overcome" -- Melissa Etheridge