Many forums, Blogs, and other web services allow you to have images as part of your signature. twitsig.com allows you to display your current twitter status as an image.

gtwit is a dynamic web based client for that supports history and personal search of your tweets by storing them on Google's cloud features * no install required - works in any modern web browser * stores all tweets you send or follow on google's cloud infrastructure so you can search your tweets by person, word or tag * allows smart completion of people or tags (just hit @ or # in the text boxes) * supports multiple twitter accounts