The GNOME Foundation Board thought it would be nice to have an official "Member of the GNOME Foundation" logo for people to put on their visiting/address cards, but usually not business cards. This is all part of making it easy for the right people to use the GNOME trademark.
James Bowes did an example of a card with the logo. Anyone should feel free to improve on this and tell the marketing-list about it. In particular, Inkscape does not give much control over text yet, but maybe there's another way to make the text line up properly.