I’m currently working on a Twitter Mashup.
You can see a video demonstration in the bottom of this post.
The idea is actually quite simple. I have worked out an algorithm, that can make a giant mosaic from any Twitter Profile Image. The final image will be around 100 megapixels, and will be made from 50.000 small 45×45 pixel thumbnails from your followers profile images. The follower-images will be sorted beautifully to resemble the colors in your Twitter Profile Image. You can see a small scale version to the right, and make sure to see the demo video below.
@TechPatio’s profile image made from his own followers’ images:
Update: Browse the full 100 Megapixel image