Original title: Old Greek houses in Sinop city, Black Sea, Turkey
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Do steps 1 - 3 from http://www.gimp.org/tutorials/Photo_To_Sketch/
Then Colors | Invert.
Layer -> Transparency -> Add Alpha Channel
Select -> By Color (click on background)
Edit -> Cut
Image will be flashing. Save as PNG.
Original title: Night view of Uzun Lake (Uzungol)
I've taken this from the pontian.info site with the intention of linking to its information and bringing attention to its work.
Original title: Mosaic from Roman era, Samsun, Turkey
"This graphic is free for download, the premium member will have commercial use license."
Village of Hapsion