Bushes, etc
old memory pillow, old foam from any sofa pillows or indeed filling from sofas chairs etc, you can throw them in a food blender then colour them. Food colouring is usually easy in a food blender as it washes out without you wrecking the appliance and your marriage!
Bushes
moss grows on concrete and bricks and dries out nicely, and makes nice bushes, you could dip it in preserving products, but i have never done so, handled carefully they can be moved a round, some may fade in colour ut so far i have not removed any from the layout.
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Trees, I saw twigs were mentioned and they look great, not just as live trees, but as dead trees, if you are lucky enough to find any branches with lichen, then look great in pictures
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Grass, dried
pampers grass ripped into small pieces, a little of this goes a long way, and you can colour it too if desired, great for water edges
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Leaves
birch seeds, these can be coloured for left, autumnal colours or green or dried leaf brown as is
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although this is on a !:43 vehicle I usually use them on 00
Horsehair is also in this picture, the bush to the right, I bought this already mixed with glue, but you can do the same, the stiff stuff is good, but you can get away for dog brushing, cat brushing, goat brushing, even wool snagged from fences where sheep rub themselves can be useful. Even beard clippings.
If you have used a simple on-off switch, could you please let me know how you wired it? 
