I think these things are pretty nifty, if prohibitively priced.
1. Genetic Portrait
Dogster.com had a giveaway for a "Pet DNA Portrait". I had never heard of such a thing before, and of course I was immediately smitten by the idea. Especially because you can get it as your very own "dogtag" style necklace, or ring. It's one of those things just so specific that it will only ever mean "My dog" to the person wearing it.
2. Dog Nose Print Jewelry
I first saw this in an Uncommon Goods catalog, but a search of "dog nose print" on Etsy reveals a lot of people are on that bandwagon. Would I wear a necklace of Elka's nose? Oh yes. I would.
3. Dog Breed Blueprint
Also on Uncommon Goods, you can get a "blueprint" of your dog's breed. There's a little blurb about the history and general appearance, and a drawing of the breed that has highlights of various points. In profile, the Doberman one actually looks a bit like the Australian Cattle Dog, unfortunately, which makes me feel less bad about not allowing myself to splurge on that $185 price tag.
4. Paint Kit for Dogs
Considerably cheaper than some of the other options, the paint kit for dogs allows your dog to paint a "masterpiece" that you can frame and hang. No, it doesn't come with a brush; you put the paint on the surface, cover it with plastic, and have your dog walk on it so it get smushed around. Uniquely.
5. Dog Cameras
On Think Geek, you can find a digital camera to hang on your dog's collar. At DogTek, they have a digital videocamera for the same purpose. Really, with the way some of my pictures turn out, Elka's shot at them couldn't be much worse! I've seen the result of some people using digital cameras on their dogs' collars, and I've thought that the results are cool. It's a different angle, different perspective.
6. Pet tattoos
I don't have any specific sites to link for this one, because it is so subjective. Every area has its own tattoo artists who have their own strengths and weaknesses. Everybody who opts for a pet related tattoo picks different things: pawprints, names, portraits. L.A. Ink, or some of it, is on Netflix, and I saw a decent share of dog portrait tattoos there. Jennifer Aniston got her dearly departed dog's name tattooed on her foot. It's a permanent tribute, certainly on par with (if not surpassing) having your dog's DNA done up as a portrait, or wearing a nose (or paw) print in jewelry form.