SVG: fractalNoise (Warning: Might be slow!)

noise.svg

<!-- Meant to be used as a CSS background through an external file or URLencoded data URI -->
<svg width="100%" height="100%">
<defs>
<filter id="noise">
	<feTurbulence type="fractalNoise" baseFrequency=".7" />
	<feComponentTransfer>
	        <feFuncR type="linear" slope="2" intercept="-.5"/>
	        <feFuncG type="linear" slope="2" intercept="-.5"/>
	        <feFuncB type="linear" slope="2" intercept="-.5"/>
	</feComponentTransfer>
	<feColorMatrix type="saturate" values="0"/>
	<feComponentTransfer>
		<feFuncA type="table" tableValues="0 .3"/>
	</feComponentTransfer>
</filter>
</defs>
<rect width="100%" height="100%" filter="url(#noise)"  />
</svg>