I wrote flickrCC so I could easily find photos on flickr that were released under the creative commons license. Stuff that I could use for my experiments with the GIMP or include in my blog.
In Nov, 2010 I created a mobile version, which differs a little from the description below, but runs in much the same way.
The panel on the left of the original displays the first 36 photos matching your search term. Click on any of these thumbnails to get a slightly larger image and the attribution details displayed in the right hand section. Right click the image and 'save image as' if you want to use this size, or click on the link in the attribution text to go to flickr and chose a different sized image. Don't forget to include the attribution text in any work you produce using the picture.
To use the web app. just enter a word (or words) into the textbox. Click on 'find' and you'll get all photos with a CC license that match *all* the search word(s) in the picture's title, tags or description (sorted in order of 'interestingness', the photo voted most interesting first). The CC licences for a default search are: "Attribution License", "Attribution-NoDerivs License", "Attribution-NonCommercial-NoDerivs License", "Attribution-NonCommercial License", "Attribution-NonCommercial-ShareAlike License" and "Attribution-ShareAlike License"
If you want to edit a photo, you'll need to restrict the search to just those licenses that allow derivatives. Checking the 'for editing' box ensures that just those photos licensed: "Attribution License", "Attribution-NonCommercial License", "Attribution-NonCommercial-ShareAlike License" and "Attribution-ShareAlike License" are returned
Either way you're going to have to attribute the picture. I always use a CC license on my material, and don't go in for commercial uses, so the other varieties of CC license are irrelevant to me personally, YMMV.
Recently I've been doing some work on wikiversity, and needed some images to liven up some otherwise boring entries, so I needed to find images licensed for commercial use (a reqirement of the wikimedia GPL), so I added a 'commercial' checkbox which restricts search results to CC Attribution and Attribution-ShareAlike License
and that's about it - one last note: I've been asked why I haven't included the photographer's name in the attribution. It's simply because I wanted the application to work quickly. Flickr requires another call to their API to get the user name and for 36 thumbnails this was taking an appreciable length of time, so I left it out. If you click on the image link you can find out all about it on flickr. Have fun with the app.bbb
I've added some links to different sizes of each picture - the bigger ones look pretty horrible in the current layout, but I kept having to visit flickr and then click on 'all sizes' to get the larger image sizes for editing, so I decided to make the process a bit faster by adding direct links
Once you've found a size you like just right click on it and 'save picture as...'