This is personally one of my weird fetish when female boobs transforms into another sentient being or into different objects. The first two I recently found on Pivix which had a link with the artist's blog and the last one I found by chance (would be nice if someone could translate what they are saying). The third one is a joke comparing Fiona's boobs (from Zoids) to Kirby from the fact that their seiyu's are the same person. The fifth one which I posted once is Jessica from Dragon Quest having her boobs turned into slimes. The last few are from the famous Titi Ninja CG set, a ninja with the ability to use her boobs into different sort of weapons. The very last one is actually her clothes being pocessed by some spirit, but I quess I'll add it anyway.
Edit: Added a couple more things I had.
http://g6triglav.blog94.fc2.com/