some grass bushes that i use in my pictures 8D i make my own brushes, it makes the picture feel more like your own when you make everything for it. and it seems less uniform and predictcable.
EDIT: HOW TO USE IT THE 88 WAY.
i just save the image and then i erase everything except the one brush i want to use. keep it as a white BG. then i define brush and BOOM you got a new grass brush 8)
lol well my photoshop doesn't have a pen tool >.> so I was just saying it would be cool if someone could make a brush that worked like the pen tool (I think it's impossible, but it's nice to dream XD)