Pidgin themes, Pidgin smilies, Pidgin sounds
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Use players at the left side to listen the theme sounds.
To install the "angrybirds_pig_1_2" sounds set, you should download it using the link below, unzip files and place it into themes folder. That folder's location depends on OS you use.
%appdata%\.purple\themes
Extract the content of the downloaded file into the "~/.purple/themes" folder and select new sound theme in the Pidgin preferences.
Note: "~" is your "home" directory in Linux, i.e. /home/username. To see the ".purple" folder in there, you might need to enable "Show hidden files" option in your preferred file manager.