This workflow extract & save icon from any OS X apps to your Desktop. Just type icon and choose the app.
By default it saves icon in 512px and PNG. Feel free to change this parameters.
If you want to save max resolution pictures just delete this line from the script:
--resampleHeightWidthMax 512
Based on a bash code from Brett Terpstra. Alfred 2 theme by @egla.
Enjoy! http://cl.ly/3c2h0S0t1I3K