I knew that doves were symbols of peace but a pigeon with an olive branch?
Photoshop: I masked the bird using the magic wand, copied and pasted into another layer. Played around with the background colors by adjusting the curves, added noise, nothing looked good so I added clouds and ran the mosaic filter on the clouds. Found an olive branch photo, silo, copy and paste above the background but below the bird layer, set opacity to 80%. For the bird layer, I filled it with 60% white, then flattened all layers.