I had a basic plan to build some simple road-side embankments (or river banks), spent a few days playing about.
Simple construction - based on hardboard (or CDs), various bits of polystyrene packaging, cheap plaster filler, cheap acrylic paints from The Works, railway flock - done. I also bought a box of trees from the local model shop and these push straight into the polystyrene (I may glue them in once these get to Spain)
After looking at these pics, I was thinking of by adding foliage and lichen you get quite cheap bocage??
Also built a few hillocks?
More piece awaiting trees