This is exactly what I was looking for. I would like to see some of the graphics somehow with transparency in their tiny backgrounds so that I can place some mountains right in front of the a forest. Similarly, buildings with transparent backgrounds and/or with translucent shading might be easier to place on a variety of other surfaces (like the lighter green grass or brown swamp/mud).
Totally unrelated, I would love to see some ruined versions of the buildings. I'm working on a strategy game that will eventually need some kind of visual user feedback that buildings have been destroyed.
Thanks for your effort in making this!