I took one photograph and altered it in layers. I took this photo at an Arcadian village in Louisiana a couple of years ago. I just love the quick painterly effect that can be accomplished with just a few keystrokes!
The background layer was duplicated, then a filter added (filter-stylize-find edges). By changing the blend mode of the duplicate layer, amazing results happen. Each of the following has a different blend mode.
Blend Mode - Multiply
Blend Mode - Overlay
Effects - Sepia
Just the other day, I added the "stitched line" to my blog background - but that's story for another day!