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.
Step 6: Add the second layer
Step 7: Thats all folks...
I think the total cost is around £3:00 for the 24 foot of road. Calculating this as you should already have flocking material in and it uses very very little.
The last thing to do to seal it off is brush some PVA glue over it all. Remember this dries clear so you won't see it and it wil hold everything together nicely. This last part took the longest and I think from start to finish it takes roughly 1 hour to do all the strips.
Step 8: And what of that left over piece?
Well cover this in sand and you have a dirt track. Paint the sand blue/green/drown and you have a stream/river.