on sale, can be dyed
Already green, a little pricey though
It would help if we knew what you were trying to cosplay, do you have any reference images?
As far as attaching it, I used liquid latex to attach theater hair when I was the bearded lady for halloween and people couldn't tell it was fake at all. If you do that, remove the fur form it's backing first, lay a smooth layer of liquid latex on your skin, and then attach the fur to your skin.
If you want to keep it on the backing, make sure not to trim the length of the fur part flush to the edge of the backing, have it overhang and cut the edge of the backing unevenly as you would bangs. The object is to not see the backing at all. You can probably use spirit gum, but if you're worried about allergies I suggest Duo Surgical Glue (popular brand also makes lash glue)
Hope this helps you out