Ok, this might be a total n00b thing to ask, but:
Since dry ice is CO2, and that's what we all want for carbonation, could I possibly place a teeny, tiny bit of dry ice into my bottles at bottling time instead of priming sugar? Yes, I know that the pressures exerted by CO2 in a closed container can be dangerous. I was thinking that a tiny speck, just enough to fill the headspace plus a bit more would do the trick. And if, perchance you accidentally put too big a piece in there, you would just let it de-gas until it was almost completely dissolved, then cap the bottle. This is similar to a food preservation method I read about, i.e. fill a five gallon bucket with rice (leaving a little headspace), put a chunk of dry ice on top, let it fill the headspace and overflow until the chunk almost completely dissolves, then apply the lid. What say you?
Disclaimer: This is purely theoretical. I asked because I do not know that this is safe!! Do your own research. The risks you take a entirely your own.