That's almost like asking for a font for use in a movie title. I doubt
that Christopher Wren's business card (if he had one) would look
anything like Frank Gehry's, or that either would resemble William Van
Allen's.
Is the architect a modernist or classicist? Is there (or will there
be) a graphical logo with which the text should coordinate? Does he or
she have a specialty such as homes, tall buildings, strip malls, etc.?
Here's a small selection of architect's cards - some good, some
horrible, but each conveys something about the business:
http://images.google.com/images?hl=en&q=architect%20business%20cards&um=1&ie=UTF-8&sa=N&tab=wi
- Herb