It's finally here!
I proudly represent my first Blender 2.66 testbuild1 Cycles Strand rendering,It's rendered in 1920x1080 & 500 samples.
This Grass here used Smooth Curves mode in the particle settings,you must have the testbuild or wait till 2.66 version is out and you must change the feature set to Experimental.
BlenderArtist Thread:http://blenderartists.org/forum/showthread.php?281858-Cycles-quot-Strand-Rendering-quot
.Youcan download the blend file from Blendswap.
.Link: http://www.blendswap.com/blends/view/66596