Here are the final four colour schemes in the MERDC series.

Above - this is "Tropics - Verdant"............
 
 

                                                                                Above - this is "Grey Desert"
 
 
 

                                                                        Above - this is "Red Desert"
 
 
 

The final scheme in this series is "Winter - Arctic"....but as this involves no other colour except white, there isn't much point in posting a sketch of it !!!

I hope you find these useful.