So I ordered 20 tile MDF frames and the supplier sent me 23 (overruns I presume) for the same price.
In all I made 14 plain tiles, 8 road tiles (two of which are sunken roads) and one beach tile. Here is the whole set laid out on the garage floor.
One of the things that terrain tiles are great for is creating features below the surface, such as rivers, streams, ponds, etc, or hills and ridges that rise above the surface. What is often not created are those dips in the ground that can give a more rolling terrain. In my first batch of tiles I did five of them with slight dips in them in, but just small ones, a swale if you like. So this time I decided to do something a bit more substantial. I made four of my plain pieces to do just that. The dip is not deep - my tiles are 20mm deep overall and at its deepest the dip is only 13mm below the surface, so it is just a dip rather than a gully. I made them so that they can interface with other dip sections and run for 600mm or more. Two of them have a dip the runs the full length of the tile while two are 'end' pieces, so that they can form one long dip, or two short ones running in from the edge.
I am quite pleased with the way they turned out and at some point may do another five or six of them. Although they don't show up particularly well when photographed, you can see the profile of the dip in the stack shown below.
The only tile that is worth photographing individually is the beach tile with a rocks feature tgat extends out into the water. The addition of this one tile gives me six beach tiles and that means I can now have a beach that runs the full width of the table.
Also complete are the first three of eight small fields that will lay on top of the tiles, helping to conceal joints