It appears that my original reply got lost in yesterday's outage, so I'll post again...
I have "Mexican" Deer Grass that I cut in 3-4" lengths to use as tall grass in a 1/35th armor dio I'm building. It's light tan/yellow in color and has very fine fronds. I haven't tried to dye or paint it, 'cause it's perfect for my use.
I'm between cameras so I can't post a picture, but if you're interested PM me your address and I'll send you a bag of it.