We've just finished a commission for a customer in the USA who wanted 24 terra-former tiles finished in spring green flock suitable for 15mm gaming. The set covers a 6' x 4' wargames table and can be rearranged in countless ways.
Each tile is 12" square and is encased in a sturdy 3mm MDF frame to prevent warping and chipping. Each side of the tile has 2 embedded rare earth magnets to hold the tiles together and prevent in game - drift.
Terra-formers are normally supplied as kits for home assembly and have a wide range of profiles including rivers, streams, canals, beaches, cliffs, trenches, sewers, hills and much more.
Full details and loads more photos in gallery @
http://wargamesbuildings.co.uk/terraformer