With OSX Mavericks we now can make notifications with applescript pretty easily. However, there doesn’t seem to be a way to change the icon that appears to a custom one. Is there a way to accomplish this?
As of the Apple Documentation
display notification does not have a parameter to change te icon.
Display notification will use the icon of your script. One of your option is to change the icon of your bundle (cf screen).
I found a nice way to do it. You must Show the content of your app and change the AutomatorApplet.icns inside "Your App.app/Contents/Resources/AutomatorApplet.icns"