There are piles of free clipart and photos available on the Web. The biggest problem is the time it can take to find what you want. The collections designed for teachers are the most useful but are fairly limited. If you or your students have any intention of publishing projects using these pictures be absolutely sure that they are royalty/copyright free!
Creative Commons Creative Commons is a nonprofit organization that enables the sharing and use of creativity and knowledge through free legal tools. It gives copyright licenses to provide a simple, standardized way to give the public permission to share and use creative work.
Artvex.com Good collection organized by categories
CAPL Culturally Authentic Picture Lexicon Select by language
Clipart Links for Busy Teachers From The Canadian Association of Second Language Teachers.
Clipart Review Links to many clipart sites
ClipArt ETC Over 60,000 pieces of free clipart with a friendly license for teachers
DHD Multimedia Gallery Original stock photography, clip-art, sounds and video clips
Discoveryschool.com Clip Art Gallery Pictures for teachers.
flickr website for users to share and embed personal photographs
FreeFoto.com Mixed bag of photos. Try the food and weather categories.
Google Image Select "Image" and type the word you want. Be prepared for thousands of responses. It’s overwhelming, and most are completely useless for our needs, but you can sometimes find the perfect picture. You can search by type (photo, clip art, line drawing), color, and size. Pay attention to the size of the image. If it’s too small it won’t look good if you enlarge it for a PowerPoint or to show to the class. Under Search Tools select Usage Rights: "Labeled for reuse."
Indezine Links for free images.
LanternFish Good flashcards, mostly in English but some in French and Spanish. The English flashcards can be adapted to other languages. Currently when you go to the site you get a message that "This page is unavailable." However, you can still do a search from it.
National Geographic They have Photos of the Month and weekly wallpaper downloads. Look through the archives, and you may find something you can use. In any case, they’re great pictures.
Pics4Learning Large collection, mostly photos
Royalty-Free Clip Art Collection for Foreign/Second Language Instruction Line drawings developed at the Japan Project at Purdue University. Good for any language.