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

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

<screensaver name="cynosure">

    <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="Number of iterations." _low-label="Less"
            id="iterations" type="slider" default="2"
            arg="-iterations %" low="1" _high-label="More" high="100"/>

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

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

</screensaver>