I made a short tutorial about making nice looking grass in Blender, which can be rendered with Cycles. It's very easy and result is quite good, so check it out!
Hope I didn't forget something important and you don't forget to leave a comment :)
Blender 2.63/Cycles+Gimp
LINK:
http://deargruadher.deviantart.com/art/Making-grass-in-Cycles-Tutorial-321383069