Nothing is better than free advertising. Of course, hardly anything in life comes at you for free.
My best form of advertising is wearing the stuff that I keep for myself. That way, when someone says, "I like your necklace," I can respond, "Really? I made it" as I shove a business card in their face. I keep my duds, or I give them away, but I never really make something specifically for myself.
I work in a hospital laboratory, and I can wear anything I want except jammies, sweats, or jeans. I wear scrubs 99% of the time, as I hate everything about waking up in the morning, including getting dressed, and scrubs are the easiest thing in the world. However, if I have big plans after work I'll wear real clothes. For me, that's when I get most of my advertising in. I don't tend to wear jewelry with my scrubs because, it just doesn't look right.
I've had this metal pendant around for so long, I don't even remember where I got it. I got a good deal on some black and white bone beads and decided its about time I treat myself to a custom made for me piece. I'm just waiting for an excuse to wear clothes to work so I can sport it around. It's about the cheapest form of advertising, and I'll certainly get personal use out of it too!