Retrievr is an experimental service which lets you search and explore in a selection of Flickr images by drawing a rough sketch. Currently the index contains many of Flickr's most interesting images. If you'd like to have your images (or the images for a
J. Thom-Santelli, and D. Millen. CHI '09: Proceedings of the 27th international conference on Human factors in computing systems, page 2081--2090. New York, NY, USA, ACM, (2009)