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

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

<screensaver name="spiral">

    <command arg="-root"/>

    <number low-label="Time between redraws:" id="delay" type="slider"
            default="2" arg="-delay %" low="1" high-label="Seconds"
            high="20"/>

    <number label="Speed of Motion." low-label="Faster" id="cycles"
            type="slider" default="350" arg="-cycles %" low="1"
            high-label="Slower" high="500000"/>

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

    <number label="Number to use." low-label="Count:" id="count"
            type="spinbutton" default="40" arg="-count %" low="5"
            high="1000"/>

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

</screensaver>