Not personally, but an old acquaintance of mine told me he used to just get a block of dry ice, slam it with a hammer into little chips, drop a few chips in a bottle that was filled with uncarb'd beer and slam on a cap. (pre-screwtop days)
He claimed it worked great, but I've always thought it was just nuts. Too many issues to list ranging from quality, consistency and outright dangerous on so many levels.
JW