Seems that most graphic artist don't have a clue as what it should really look like. I came up with this odd blue tile and went to town.
I've included 2 actual sets for flexibility. One thing I disliked was the forcing the roof to be a certain width. It's either odd or even depending on the tileset your working with. The woodland tileset uses a center piece to almost force an odd number width of the building.
Screen shot of roof in TMW:

The WIP Tileset added with the block wall extras:

Is there a particular standard to the tileset size or what is considered a good max size?
The shading is very basic and I'm not quite sure I have it right. I am thinking of adding a fascia and barge-board to the roof perhaps with the same wood texture that is used on the block wall set. For reference to what that is look at for example
http://www.bricksandbrass.co.uk/archite ... s/roof.php