Hacking the Analogue
This digital stuff is all very well, but how can you hack it? Well, maybe along the lines of these hackable T-shirts:C-Shirt shirts each come with a scannable little QR (Quick Response) code in the corner. If you see a C-Shirt that you like, worn by someone walking around town, you can scan the QR code with your mobile phone. (Especially if you're in Japan where people scan QR codes with their phones all the time.) Your phone then captures the shirt's unique URL on the Nota website, where you can load it up and edit the design however you like.
Each design is given a Creative Commons license (that's what the C stands for) according to the wishes of the creator. Once you've got it how you like it, you can have it shipped to you just like any other T-shirt website would do.
So this is how it would work.
Hackable (physical) objects that had digital blueprints would display (discreetly) the QR code, allowing you to download the blueprint and hack it, before uploading it to the supplier. All we need are some fabbers....