Everyone knows a picture tells a 1000 words. But online images are a different kettle of fish.
Thanks to Google Images, it is very easy to borrow images from any website or server and most probably infringe on copyright laws.
Here are a couple of sites that you can do just that but it is allowed;
Unsplash.com undoubtedly the best out there
Undraw.co vector graphics used by everyone that you can adjust the colours before downloading
Pixabay.com nearly 2million images at your disposal
Pexels.com over 1 million images to utilize
Let us know if you find any useful sites that we could add to this list.