gnome-control-center/capplets/screensaver/screensavers/bouboule.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="bouboule">

    <command arg="-root"/>

    <number _label="Number of Colors." _low-label="Colors:" id="colors"
            type="spinbutton" default="64" arg="-ncolors %" low="1"
            high="256"/>

    <number _label="Speed of Motion." _low-label="Faster" id="delay"
            type="slider" default="2" arg="-delay %" low="1"
            _high-label="Slower" high="500000"/>

    <number _label="Number of bubbles to use." _low-label="Count:"
            id="count" type="spinbutton" default="1000" arg="-count %"
            low="1" high="10000"/>

    <boolean _label="Use red/blue 3d seperation." arg-unset="" id="3d"
             arg-set="-3d"/>

    <boolean _label="Display screensaver in monochrome." arg-unset=""
             id="monochrome" test="mono" arg-set="-mono"/>

</screensaver>