Google Images allows you to search for images and narrow to a specific reuse permission. This can be a fast easy way to find images for a project. To do this, go to the Tools menu after you run your search, then select Usage Rights.
You have the following options for Usage Rights:
If you are the creator and the copyright owner, great!
If you are posting or publishing photographs you have taken, get the written permission of the subjects. See the language in this sample Media Waiver.