Since some of you have been asking, here are the base images that were used to make my recent "Flight" wallpaper —
And here's the step-wise process —
1. The three images were overlayed on each other.
2. Orientations of the images were matched to make it appear as if the birds were flying in the same direction.
3. Overlapping birds were cloned out.
4. The tones, brightness and contrast were adjusted.
5. Finally, text was added to produce the final image.