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

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

<screensaver name="forest">

    <command arg="-root"/>

    <number label="Number of Colors." low-label="Colors:" id="colors"
            type="spinbutton" default="100" arg="-ncolors %" low="1"
            high="256"/>

    <number label="Delay between redraws." low-label="Faster"
            id="cycles" type="slider" default="2" arg="-cycles %"
            low="1" high-label="Slower" high="500000"/>

    <number label="Number of trees to use." low-label="Count:"
            id="count" type="spinbutton" default="100" arg="-count %"
            low="1" high="1000"/>

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

</screensaver>