That is my ESP at work…
Actually, the background is the same in both pictures. The one with lone Tree in it, was done by a sillohet of a tree I got from somewhere else. the image on the right, actually already had that tree and shrubs in it.
As for how to obtain, first you might want to let me know what size you want them to be. I can make them most likely as small as about 150px to as large as … 450px or so. Also since you want the outside to be transparent, is this for a light colored background or a dark. I will then post a url to the images.