I have a little hack for you. I ran into the same problem and solved it by raising the jquery event as follows:
<p:growl id="idGrowl" life="3000" closeable="true" > <h:outputScript> $("#idGrowl_container").effect("pulsate", { times:3 }, 2000); </h:outputScript> </p:growl>
You must apply the effect to your id + "_container". Make sure your jQuery Selector points to the correct generated identifier on your jsf page, so be sure to s with your growl. To apply the bounce effect, just make small changes to the effect, as described below: http://api.jqueryui.com/bounce-effect/
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