Just a quick mention that it is very easy to create hills for World Works terrain using insulation board - either the blue or pink will do - and a hot wire cutter. (You can find these for around $10 at most craft stores.)

You can even use the hill with the Masterboards, cutting out the masterboard in the shape that you want for the top of the hill, gluing it to the foam, then cutting around the printed section, angling outwards. Paint the edge of the insulation board with acrylic craft paint. A sandy yellow-brown seems to work best. (At least for Village Works and Sea Works: Skull Cove.) If you are feeling motivated you can drybrush a lighter version of the same color for highlights.

I used this method this summer for Sea Works: Skull Cove and Village Works. In this case covering most of the foam with Masterboard, then using the hot knife only on one edge of the insulation board.

The Auld Grump, cleverly disguising an earlier blunder...