This Photoshop effort managed to fool a few people. I took a photo of Simon Davies testing the wind for a paragliding flight (see:- Colley Hill Paragliding). I then sized/distorted/added the wings from a butterfly.

The shadow on the grass was acheived by building up the existing areas of shadow using the lassoo tool to select, copy and paste, flattening the image at each stage. When there was a sufficient shadow area, the shadow could be "drawn" with the lassoo tool, then moved over the area to be copied. When pasted back the shadow section was moved into place.