Tumblrr is a nice simple app which reduces your favorite tumblr blog into one abstract picture, the application makes a kind of collage, working with the image opacity. Tumblrr was created by Jonathan O'Conner, recent graduate of the Rhode Island School of Design with a BFA in Industrial Design.
It's nice to use this app with architecture or fashion oriented tumblr blogs, sometimes it makes interesting compositions. It's also funny to try it with blogs which publish animated gifs, the result is an animated collage. See more;
Introduce your tumblr blog here.