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

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

<screensaver name="pyro">

    <command arg="-root"/>

    <number _label="Particles on screen" _low-label="Count:" id="count"
            type="spinbutton" default="100" arg="-count %" low="20"
            high="1000"/>

    <number _label="Frequency of missile launch" _low-label="Slower"
            id="frequency" type="slider" default="30"
            arg="-frequency %" low="10" _high-label="Faster" high="100"/>

    <number _label="Number of particles" _low-label="Less" id="scatter"
            type="slider" default="20" arg="-scatter %" low="10"
            _high-label="More" high="100"/>

</screensaver>