From the About us page:
As Visual & UX designer and Lean Startup coach I create a lot of landing pages and prototypes to collect feedback and test various business ideas, so I know how important it is to make things FAST yet still beautiful (yes, we all believe in low fidelity prototypes but people still prefer beautiful things :)). Finding images that carry the right message usually takes hours, therefore every photo I make in my spare time will appear here for you. All of them are free for personal & commercial use.