Finding CC licenced images on Flickr

Go to the advanced search on Flickr: http://www.flickr.com/search/advanced/

• In "Search for", enter the words you are searching for (either in 'tags' or 'free text')
• Further down, select "Only search within Creative Commons-licensed content".

For example,

• to search for the tag 'animal', with any CC licence, use this search: http://www.flickr.com/search/?q=animal&m=tags&l=cc&ct=0&mt=all&adv=1
• to search for the "free text" 'badger', with a CC licence that allows derivatives, search like this: http://www.flickr.com/search/?q=badger&l=deriv&ct=0&mt=all&adv=1

To find out more about the "no derivatives" clause, see http://wiki.creativecommons.org/Frequently_Asked_Questions