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

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

<screensaver name="goop">

    <command arg="-root"/>

    <number _label="Number of bubbles to use." _low-label="Count:"
            id="count" type="spinbutton" default="10" arg="-count %"
            low="1" 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"/>

    <boolean _label="Have transparent bubbles."
             arg-unset="-non-transparent" id="transparent"
             arg-set="-transparent"/>

    <boolean _label="Use additive color model."
             arg-unset="-subtractive" id="additive"
             arg-set="-additive"/>

</screensaver>