Here are some links to Creative Commons sites where you are allowed to use the pictures as long as you GIVE CREDIT to the person or person(s) who created the pictures.

Images:
Welcome to Stock.XCHNG

Flickr CC is a site that searches Creative Commons images from Flickr.com

http://morguefile.com/
The Morgue File contains free high resolution digital stock photographs. BEFORE YOU DOWNLOAD: check the terms of use.

http://openphoto.net/ Click on search in the top bar or browse by category. There are lots of great images here

http://office.microsoft.com/en-us/images/ This is the link to the Microsoft Clip Art and Sound Library.

Copyright Free and Public Domain Media Sources This is a great collection of links to other resources especially the Smithsonian Museum, government resources, moving images, etc.















Images
Creative Commons Search - Search many sites at once *Our Favorite!
StockVault.net – Free images from photographers around the world
Kozzi.com – One free photo per day
FindIcons.com – Huge resource for avatars or small images
Flickr Advanced Search – Use advanced search filters to show only CC licensed images
Videos
You are free to embed any video from YouTube, Vimeo, WatchKnowLearn, etc. on your blog or website as long as it gives you the embed option.
That being said, you (or your students) can’t necessarily use parts from videos on YouTube (or other sources) to make mashups or as part of another video. Be sure to have permission to use any video that you are cutting, making changes to, or adding to a project.
Curriculum and Text
Wikipedia - Quote away (with a link back) to any information you find on Wikipedia
Curriki - An open curriculum community
Collaborize Classroom Library – A growing resource for discussion questions, lesson plans, and more
You won’t be able to add student resources from most textbook companies or purchased curriculum – so be careful and make sure you have permission before doing so!
Related Posts and More Info on Copyright
TeachingCopyright.org
CreativeCommons.org
Copyright.gov

(Taken from http://theedublogger.com/2012/02/09/the-educators-guide-to-copyright-fair-use-and-creative-commons/)