Instead of searching for garage door images to apply to the "plain" 3D door try Garaga's website which allows you to build any combination of size, panels, colors, accessories and glazing producing a clean non-perspective image with no light source.
http://www.garaga.co...ntre/selection/
Right click on the image and "save picture as" into your textures library. Because there is no light source it is easy to edit the image for non-standard window configurations.