You shouldn't need to. Beryl, named Compiz Fusion now, is installed by default in 7.10. Go to System > Preferences > Appearance, then click on the Visual Effects tab. You can turn it on there by selecting either Normal or Extra visual effects.
There's also another hidden setting you can add too. But in order for me to tell you, you have to be let in to the super-duper-dodeca-secret brotherhood of Linux users.
Here's how you do it... Open a terminal and type in:
sudo apt-get install compizconfig-settings-manager
Once it's installed, a new setting, Custom, will show up in the Visual Effects tab. Every effect that Compiz can do will be thrown in there. Be prepared to be overwhelmed by the choices.
Also, keep in mind that your video card may not be able to support some of the effects, so your results may vary.