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

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

<screensaver name="attraction">
    <command arg="-root"/>
    <select id="mode">
	<option id="balls" _label="Balls" arg-set="-mode balls"/>
	<option id="lines" _label="Lines" 
	        arg-set="-mode lines" test="mode = lines"/>
	<option id="tails" _label="Tails" 
	        arg-set="-mode tails" test="mode = tails"/>
	<option id="polygons" _label="Polygons" 
		arg-set="-mode polygons" test="mode = polygons"/>
	<option id="splines" _label="Splines"
		arg-set="-mode splines" test="mode = splines"/>
    </select>
    <number id="threshold" _label="Threshold of repulsion" 
	    _low-label="Small" _high-label="Large"
	    low="0" high="500" default="100"
	    type="slider" arg="-threshold %"/>
    <number id="segments" _label="Length of Trail"
	    _low-label="Short" _high-label="Long"
	    low="1" high="1000" default="500"
	    type="slider" arg="-segments %"/>
    <number id="speed" _label="Speed"
	    _low-label="Slow" _high-label="Fast" type="slider" arg="-delay %" 
	    low="0" high="20000" default="10000"
	    from-cli-conv="20000 - var" to-cli-conv="20000 - var"/>
    <select id="use_color">
	<option id="color" _label="Full Color"
	        enable="number_colors,color_contrast"/>
	<option id="mono" _label="Monochrome" arg-set="-mono" test="mono"/>
    </select>
    <number id="number_colors" _label="Number of Colors"
	    type="spinbutton" low="1" high="400" default="200" 
	    arg="-colors %"/>
    <number id="color_contrast" _label="Color Contrast"
	    _low-label="Low" _high-label="High" type="slider"
	    low="0" high="25" default="3" arg="-color-shift %"/>
</screensaver>