Do you have the error message it generated please?
You need to install these packages - using
sudo apt-get install compiz-fusion-bcop compiz-dev compizconfig-settings-manager build-essential libtool libglu1-mesa-dev libxss-dev libcairo2-dev git-core
Then you should probably create a director (mkdir) ~\compiz
Navigate to the directory in terminal and
git clone git://anongit.compiz-fusion.org/fusion/plugins/snow
Download this file to the correct directory: https://sites.google.com/site/oreaus/snow.tar?attredirects=0
Make sure the directory is now ~\compiz\snow
Execute:
make
make clean
make install
Open compizconfig-settings-manager and activate the plugin.