We have developed some mashups using Flickr. If you want to try them:

Bubblr. Create comic strips using Flickr images

www.pimpampum.net/bubblr/

Phrasr. Illustrate the phrases that users submit.

www.pimpampum.net/phrasr

Bookr. A tool to create photobooks using Flickr images.

www.pimpampum.net/bookr/archive.php

Memry. A classic memory game.

www.pimpampum.net/memry

Flickr Real Time. 3 applications which visualize on real time the flow of information that constantly is receiving Flickr.

www.pimpampum.net/rt