Sometimes you ask me, where do I get all those photographs I use on this site or in themes examples. Well, there are a lot of public-domain or free to use sources, but I am especially pleased with unsplash.com. Of course it is rather small source (comparing to paid sources) but it’s still enough. And quality of the photos are excellent in most cases. So, feel free to use it!
PS: I am not connected with unsplash.com in any way, except for using their photos!
Horizontal images gallery
Vertical images gallery
Note that I decreased a lot of those photographs dimensions and obviously I use only those pictures I used in the post image collage.