For some especific professions where creativity is expected as part of your traits, your business card is the first place where you should show you have what it takes. Of course, there is your portfolio, but you don't go with your portfolio everywhere, while you can take your business cards anyplace.
4. From my pont of view, the best one: She is a hair professional and make up artist, therefore the bobbypins as hair gives the card an extra touch, that is completely related to the 'product' that she offers.
If you want to see the whole collection just visit 'business cards' at Flicker.