If the top Google search results for your unique online name lead to web pages under your control, you can take advantage of the search engine and save on business card design. The card of "Mister Jalopy" is simply a screenshot of Google's home page, with his alias in the search box. Easy to make (grab a screencap), and easy to print (for companies that do four color plus grayscale publishing).
Of course, we can't stress the terms "unique online name" and "Google domination" enough. And it's pretty hard to push something like "Herr Old Car" to the top of Google if you aren't a frequently-linked-to writer of sorts—who writes on a high-traffic website no less.