explains step-by-step how he painted 
From Alpha Strike Games Limited
PDF – Sale Price $1.49 USD
This is a set of 47 color tile maps, each 7 x 10 tiles. There are several variations of some of the maps, hence a low price. Print them out, glue to card, cut, put them on the table how you want, and have at it.
These can be used in just about any sci-fi RPG or tabletop skirmish game.