It may no longer be as necessary as it once was, but recycling old clothes, offcuts and remnants can only be a positive way of limiting our modern, wasteful ways.
I have a box filled with remnants of my painted silk. Mostly small pieces too small to be individually sewn into anything useful, but large enough to be cut into strips and hooked into hessian.
Naturally, most of the weight of the silk I use when painting is too fragile to hooked into a rag rug, but it is definitely sturdy enough to be made into a cushion cover.
I have combined the painted silk scraps with dyed wool, old dyed cotton t-shirts, remnants of velvet and strips of various mixed fibre textile oddments all found in my rag bag.The finished cover kind of resembles my original photograph that I used as the basis for the design.