Step 1: The materials
I also have grass and sand flocking material, some PVA glue and the find some self adhesive flooring panels. These I purchased from my local £1 store. i got 4 lengths in a pack for £1 and it gives you roughly 24 foot of track/road depending on how you cut it. You also need some scissors and a bowl to catch the flocking material.
Step 2: First things first
Step 3: Ohh! look a sort of Road!!!
Dont throw that off cut away.
Step 4: Now Flip it
You now have a pre-glued surface to take you materials on.
Step 5: Add the first layer
Place it over your bowl or other container, you have to catch those chippings save money.
And now scatter your chosen material all down the strip. Shake off the loose bits.