Good tile maps are a surprisingly scarce resource. When I published my recent Tiled Map Editor tutorial the most common question was where can I get good isometric tiles. So I decided to look at the process of creating tilesets using Blender.
This text tutorial (or this video version) covers exactly that. Setting up an object, the camera, the renderer etc. to be rendered in a Tiled friendly way. Then we look at using the array modifier to create several tiles at once, then write a quick script to render all the individual tiles.