DOSCH 2D Viz-Images: Bird's Eye - Trees is an effective way for adding 170 trees in bird's eye view.
The clip-maps are perfect "cut-outs", i.e. blend into their respective background and surrounding beautifully and naturally - they become part of the overall scene and don't look artificial or super-imposed.
Each picture comes with the matching alpha-channel, which allows for the quick and straightforward use in most CAD-, 3D-design and image processing software programs.
As usual with Dosch Design Viz-Images are license-free, and can therefore be used in commercial pictures & designs at no extra charge. All images are available in the widespread, uncompressed TIF and Adobe Photoshop formats. As an additional bonus, included are many rendered persons with a separate shadow channel.