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Cheap decorating brushes of the right colour cut up with a pair of scissors?
How much do you need? I've got a load of pale yellowy (with a hint of green) flock I bought for something or other and never got round to using. It's yours if you want it.
That won't work I'm afraid, as I need it to be flat - it will be on a terrain board, which will be stored with another board on top. And I don't want it to disrupt placing figures either.
My meaning was to cut it up into short strands that you can then glue to surface laying down.