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

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

<screensaver name="crystal">

    <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 polygons to use." low-label="Count:"
            id="count" type="spinbutton" default="1000" arg="-count %"
            low="1" high="5000"/>

    <boolean label="Center image." arg-unset="-no-centre" id="centre"
             arg-set="-centre"/>

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

    <boolean label="Have at maximum size" arg-unset="-no-maxsize"
             id="maxsize" arg-set="-maxsize"/>

    <boolean label="Cell" arg-unset="-no-cell" id="cell"
             arg-set="-cell"/>

</screensaver>