Mine

waterping.sh

#!/bin/bash
#./waterping.sh 0 0
#If you want to ping the coordinates x0, y0
dbus-send --type=method_call --dest=org.freedesktop.beryl /org/freedesktop/beryl/water/allscreens/point org.freedesktop.beryl.activate string:'root' int32:`xwininfo -root | grep id: | awk '{ print $4 }'` string:'amplitude' double:1 string:'x' int32:$1 string:'y' int32:$2

senicon.sh

#!/bin/bash
#requires waterping.sh
WINFO=`xwininfo -root -tree | egrep ' (1[2-9]|2[0-4])x(1[2-9]|2[0-4])\+0\+0' | grep "$1" | cut -d ')' -f 2-`
WIW=`echo $WINFO | cut -d 'x' -f 1`
WIH=`echo $WINFO | cut -d 'x' -f 2 | cut -d '+' -f 1`
WIX=`echo $WINFO | cut -d '+' -f 4`
WIY=`echo $WINFO | cut -d '+' -f 5`
let WAX=WIX+WIW/2
let WAY=WIY+WIH/2
waterping.sh $WAX $WAY 2>/dev/null