Like David E, further down the country, I've been out and about; looking at colours and textures in the countryside and snapping some pics for reference purposes when I get round to scenery.
As well as the colours you would normally expect at this time of year, there are numerous others less expected; some trees tend to go a darker shade of green and others lighten, not to yellow, but to an almost lime green.
Grasses are also changing, but again there is a surprising amount of greens of varying shades. Below are a few snaps for your consideration. Why not look around at the type of scenery you hope to model; observation is a fantastic tool: