A green tablecloth; normally a bit thicker than a sheet. I used one in the Tiny TV layout.
And a fleece throw is on my tiny Christmas layout. The texture is more grass like. Before it became dedicated to the holiday, I planned on using thin felt like we used to cut out and paste down for art during grade school classes, to create roads. ( I also flame tested the fabrics to make sure they didn't "flash fire".)
Both are just wrapped, and stapled apolstery style. Holes get an X with an exacto after a day for the fabric to stretch fully.
Felt is an excellent sound deadener for the track to sit on.
