It is a well known fact that in our household very few purchases (except food) are used for their intended pupose. So it was no surprise that when I spotted in the centre aisle of our local Lidl a pack of brown felt pads for the protection of shiny floors against furniture legs for less than 2 pounds/dollars/euros that I snapped them up for potential wargames use.
(I since bought a supplementary pack of beige ones, which have vanished after arriving home.)
The pack has circular pads of 32x10mm, 36x15mm and 48x20mm; square pads of 20x20mm and one sheet 200x200mm. All are about 2mm thick.

Coincidentally, within a week I needed to create for the Market Garden campaign a wargaming area of heathland in 6mm.
Some time ago I bought from eBay some Chinese model trees as an alternative to the “flocked bottle brush” type of which I already have plenty. Examples below.
In the pack were lots of tiny trees which remained in the box for potential future use.
“Aha!” thinks I, “This is my serendipitous moment.”
By twisting the miniscule tree trunks together and pressing them onto to the sticky side of the felt pads I managed to create clumps of bushes. The felt underside helps prevent them from being inadvertantly moved against the flocked base terrain hexagons.
I may decide to use my previously described method of coating the bushes with diluted PVA glue and baking in the oven at a low heat to solidify the models, but for the time being they will suffice, when properly placed, interspersed with occasional trees, to represent my heathland.