GOOGLE DRIVE BLOGSPOT
A few months ago, many of you submitted ideas on how we can expand the selection of stock images in Google Drive to add to the categories that you’re most interested in.
Thanks to your suggestions, 5,000 new photos of nature, weather, animals, sports, food, education, technology, music and 8 other categories are now available for your use in Docs, Sheets, and Slides. More than 900 of these photos were selected directly from your submissions -- we really appreciate your help!
Google Drive +:
https://plus.google.com/+GoogleDrive/
This is the easiest way to go. It's not scholarly, but it's reminding users that the images have been created by others and granting permission to be used.