Below is a complete list of all of the free image sites I have found that you can use in your blog.
**Please check the rules – some of them require you to link back to the original owner, some you will need to subscribe to their email (free), some have restrictions on how you use them!
Graffical Muse – tons of free printables!
New Old Stock – vintage photos from old public archives
Tell me of any others that are free to use!