Flickr Downloadr allows you to download hundreds of photographs from this website. Just choose a category, author or group and you'll see a list of downloadable pics.
Search for any term and you'll see a list of pictures. Don't worry about property rights, Flickr Downloadr can filter pictures according to property rights, so you can be sure you are not infringing any property right.
After that search, you'll be able to enjoy the whole list of pictures in your system. Choose the ones you want to download and press 'next' button, then, choose the destination folder and the program will start downloading.