I've printed a 3D Mars complete with mountains, plains and valleys.
http://3dprintboard.com/attachment.p...tid=5027&stc=1
I used PhotoToMesh (bowl shape). Full instructions here:
http://www.ransen.com/phototomesh/3D...D-Printers.htm
Low res results from my low res printer here:
http://www.ransen.com/phototomesh/3D...D-Printers.htm
The STL file is on Thingiverse, so if you want to get a better print...