Generating a “group picture” of your Twitter followers makes for a great visual for your Twitter background or for blog graphics.
I just ran into at tool called Twitter Mosaic which allows you to see either your followers or your friends (those you follow that follow you back).
It looks like the tool only captures about 100 followers then tiles them. So if you’re following a gazillion people then they won’t all show up.
You can also create a coffee mug or T-shirt or other products using the tool. I like the additional message on the shirt, “Are you following me?” Well are you?