I decided it would be nice to have a quick, easy way to refer people to my Etsy shop, or to give them my contact information for custom orders or alterations, and to tuck into the packages I send off. So I ordered a set of business cards. (From Vistaprint, where they're free except for shipping.)
I feel all grown-up and official now.
(Speaking of my shop, I put up a handful of vintage sewing patterns yesterday. Check them out!)