Undulatus asperatus (or alternately, asperatus) is a rare, newly recognized cloud formation, that was proposed in 2009 as the first cloud formation added since cirrus intortus in 1951 to the International Cloud Atlas of the World Meteorological Organization. The name translates approximately as roughened or agitated waves.
This one gets bigger if you save it.
Reminds me of those mathematical fractals you can get. Sort of like the 4d fractal projected onto a 3d plane...except coloured in by the sun.