I put graphic designer but that title seems to have lost a lot of impact recently. A few people I know are putting things like "creative designer", or "craftsman" which I just think is a bit pretentious.
I don't use a business card but, when I do need to use a title, I style myself 'Designer/Director'; 'designer' (rather than 'graphic designer') as I find that's how most of the people I work with refer to me (and graphic design is self-evidently what I do), and 'director' as I'm a limited company (which is an important factor in a lot of the contracts I maintain) - always 'designer' first, though, and 'director' just so people know who/what they're dealing with.
Paul's right that pretentiousness abounds in creative fields and I guess it depends on people's point of view but I find anything that isn't a simple description of who you are and what they do to be a massive turn-off. On the specific issue of 'creative designer', you have to ask yourself what the obvious alternatives are ('uncreative designer'?), and 'craftsman' makes you sound like a self-aggrandizing dick.
I used to work with a web developer who referred to himself as the Duke of URL, which I thought was kind of nice, but anything jokey or 'clever' is always a risk.
