This is a hard question to answer without knowing what type of photo you want (nature, people, tech...?) but I think you can probably find what you need from one of the many free stock photos sites. Check www.unsplash.com first, amazing selection of royalty-free photos. If you're looking for nature only, try www.freenaturestock.com (full disclaimer: I run this site). Furthermore, try www.thestocks.im.

Good luck!

https://css-tricks.com/sites-with-high-quality-photos-you-can-use-for-free/

https://tookapic.com/photos?sort=downloads&list=free almost 4000 CC0 pics. You won't find most of them anywhere else. And I suggest rushing with the downloads, because we're updating the site on Tuesday and some of the pics will go premium for sure. Still not very expensive, starting at $3.75 per single photo.

+1 for Unsplash.

Hi Nick,

We have a Creative Research wing (of one person...) who can help you out. Frequently our photographers have specific images in their personal collections we haven't ingested yet.

Email us at research@stocksy.com and we can send you a gallery.

• Rich

Hello Nick! Feel free to download whatever you want here http://moveast.me/ a project that I started more than one year ago.

I'd consider trying out Snapwire, for a crack pitching your concept and getting a slew of photographers trying their hand at your idea.

https://www.snapwi.re/

http://www.500px.com

http://www.imagebrief.com/

https://stocksnap.io/

Thanks for all the great suggestions, much appreciated!

http://allthefreestock.com/, though I liked it much more in the past. Of course it's quite time consuming.