Get a list over playermade scenarios in OpenTTD:
http://wiki.openttd.org/List_of_player-made_scenarios

This is a OpenTTD scenario I developed further from the first “Compass Cities” scenario. It has a lots of iron ore mines and forrests. Some farms and factories are there too. And a lot of oilwells.

Climate is temperate.
Scenario size is 256×256 squares.

Download the scenario file with this link

I just made this OpenTTD scenario today.
The terrain is in shape of Iceland.

Climate is artic.
Scenario size is 1024×1024 squares.

Download the scenario file with this link

I use a map like this below from Google to spread out the cities and name them. And I threw some industry out also on to the terrain in the scenario.

Above: Without industry.
Below: With some industry.

Below is the heightmap I used. Remember to turn the scenario 45 degrees clockwise to get it right then you generate the scenario of the heightmap.

It was made from this picture below.

This is a OpenTTD heightmap I made with MS Paint that comes standard with Windows. I made this using the mouse to draw with, it would maybe be better with a penlike device to draw with. See the how to on the right on how to make a scenario of a heightmap.

The heightmap below:

Colors used are:
Hills: # FFFFFF (Standard white)
Riverbank: #303030
River: #000000 (Standard black)

• Download the scenario file (without industry/cities) with this link
• Download the scenario file (with industry/cities) with this link