The Digital Public Library of America (along with DigitalNZ) recently announced a GIF-IT-UP contest. Below is an invitation to participate in an international competition to create the best animated GIF, reusing public domain and openly licensed content: http://dp.la/info/gif-it-up
Need inspiration? Check out more examples from Kevin Weir.
http://33.media.tumblr.com/de0110babc2836934c1ec5013b802b0c/tumblr_nbpb85vvRv1qlq9poo1_400.gif