Developers come across this situation many times in a day. Whether it is creating designs and mock-ups or a basic site. Finding the images is a tedious task. But guess what? This site does all the work for you and provides you all the images you ask for. These images are generated on the basis of the parameters you set in the source and can be changed as per your needs. Usage steps are pretty basic and simple.
Link to the site: https://placeimg.com/
Below are some screenshots to get you started.