I don't know about dedicated ones, but I would explore here: Flickr: https://www.flickr.com/search/advanced/ https://www.flickr.com/search/advanced/ (turn on C

I don't know about dedicated ones, but I would explore here: Flickr: https://www.flickr.com/search/advanced/ https://www.flickr.com/search/advanced/ (turn on CC image search) http://creative-commons.deviantart.com/ http://creative-commons.deviantart.com/ http://source.pixite.co/ http://source.pixite.co/ http://allthefreestock.com/ http://allthefreestock.com/