Create a Heightmap

With L3DT create designable mpa with 512x512 resolution to save it in jpg then open the map in GIMP 2.6 to save it in bmp with 24 bit color, now in heightmap2colormap create your colormap with your heightmap then create your map with pyspades map editor
L3DT download link (3.4 MB)
PySpades Map Editor download link
GIMP 2.6 download link

Or Create a heightmap in GIMP Tutorial

Or create your colormap and heightmap in Blockman2D
(only windows xp to windows 7)
Blockman2D download link