http://proceduralgraphics.blogspot.com.au/2010/06/flock-in-cloudy-blue-sky.html?m=1 http://proceduralgraphics.blogspot.com.au/2010/06/flock-in-c... In straight

http://proceduralgraphics.blogspot.com.au/2010/06/flock-in-cloudy-blue-sky.html?m=1 http://proceduralgraphics.blogspot.com.au/2010/06/flock-in-c... In straight js and canvas, with bird silhouettes and Perlin sky