Hoppy likes to scratch, pick and chew at our cushions, like the ones in the picture. But I read somewhere that it's not good to scold a rabbit like you would scold a dog or a cat. Let's just say a rabbit can hold a mean grudge.
The solution? Give him an alternative. In our case, when he starts chewing at a cushion, we run over with a grass square, like the one in the picture here. We give that to him to pick at and chew. The downside is that I have to sweep up the floor afterwards!