Preview:

Some animated grass brushes for the GIMP.
I had the idea to make them after finding a photoshop tutorial for making "grass", and that used grass brushes for photoshop. As I didn't know where to find brushes looking like this for the GIMP, I made them ;)

EDIT : Oops, I forgot to say that the best way to use those brushes is to create a gradient -from dark green to light green for example - and specify "gradient" in the brush tool options. This will allow you to paint the grass with different shades of green.
by ~duskblue
Source