I made a small Java program to view the last 7 days photos on Flickr.
You can download it and run it on your computer in an edge of the screen or in a large window as a screensaver.
I plan to add more features. It runs on Windows, Mac and Linux.
Double-click on the file after download or start fullscreen with:

java -jar Photo.jar -fs

You can also just use the Applet: