It is important to keep your business cards looking professional,
and extremely important to have all current cards resemble each
other. If you change your corporate look, replace all of your
employees' cards at the same time.
You must decide if all cards, from the CEO on down, will have
the same design, or whether the sales department's cards will
be a bit different than those of management (but, even if they
are, they should resemble each other). You have to maintain a
certain amount of corporate identity on each card, or you risk
losing the connection between person and business. Consult with
your designer, and trust what he or she suggests.