So hmmm... I found something quite randomly that might be relevant... Though I'm really not sure where to put it... It's from the second Silent Hill movie and involves and mannequin transformation... If it just stopped there I would put it in inanimate transformations, but then the mannequin monster snaps the mannequin head off and attaches it to itself... So... huh... I searched to see if this was posted, and I didn't see anything, but I could of been wrong and missed someone, in which case I'm sorry.
It does have a well done transformation and a interesting mannequin/webbing theme to it though. Now, how to perfect that into something, well, more sexy than a spider mannequin with multi spiked mouths...
http://youtu.be/nW6jOT3ghQY