Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Pinterest - Pinterest is a visual discovery tool that you can use to find ideas for all your projects and interests.
Flickr - image and video hosting website
DeviantArt - deviantART was created to entertain, inspire, and empower the artist in all of us.
Photobucket - Photobucket offers image hosting and free photo and video sharing.
Juxtapost - Bookmark, share and discover all your favorite things, side-by-side.