Something

#!/bin/bash

# change this to alter the heartbeat speed (lower = quicker)
beat_time=2;

# get a good guess about the windows that are visible
WINDOWS=`xwininfo -root -children | grep -v "+0+0" | grep -v "no name" | awk '{ print $1 }' | grep ^0x | uniq -u`;
#echo $WINDOWS;
# find out which windows have map state IsViewable
for window in $WINDOWS ; do
    wininfo=`xwininfo -id $window | grep "IsViewable" | wc -l`
    if [ "$wininfo" -eq "1" ]; then
        visible="$visible $window";
    fi
done

#echo $visible;

# start the heartbeat
while [ 1 ] ; do

    for vwin in $visible ; do
        `dbus-send  --type=method_call --dest=org.freedesktop.compiz  /org/freedesktop/compiz/wobbly/allscreens/shiver org.freedesktop.compiz.activate string:'root' int32:0x52 string:'window' int32:$vwin`;
        `dbus-send  --type=method_call --dest=org.freedesktop.compiz  /org/freedesktop/compiz/wobbly/allscreens/shiver org.freedesktop.compiz.activate string:'root' int32:0x52 string:'window' int32:$vwin`;
        `dbus-send  --type=method_call --dest=org.freedesktop.compiz  /org/freedesktop/compiz/wobbly/allscreens/shiver org.freedesktop.compiz.activate string:'root' int32:0x52 string:'window' int32:$vwin`;
    done
    sleep 0.3
    for vwin in $visible ; do
        `dbus-send  --type=method_call --dest=org.freedesktop.compiz  /org/freedesktop/compiz/wobbly/allscreens/shiver org.freedesktop.compiz.activate string:'root' int32:0x52 string:'window' int32:$vwin`;
    done

    sleep $beat_time

done