Sorry about the photo quality. Here are my Autumnal leaves that I have done so far. I am quite happy with some of them, but my attempt at an oak leaf needs some work. However I am enjoying doing something new.
I was able to purchase some Autumn coloured sock wool from our local Lidl supermarket (yes - a food supermarket). It is 75% wool and the darker one is actually varigated with all different tones of orange and brown. I think it will be very suitable.