In old RMweb there was discussion about "Teddy Bear" fabric. I saw this being demonstrated at an exhibition at Bracknell (IIRC). The fabric pile can be shaved / scissored to desired length and even-ness to suit yourself, and coloured to match your chosen season.
I think that, in general, "grassed" areas tend to look better in photos than in the flesh. (just my opinion, not trying to upset anyone!)