I recently stumbled upon this tumblr account, and my god, are the balloon animals in it incredible; they're so detailed and well-sculpted, to the point where they make the eyes and various details out of balloons. This takes me back, because my mom, when I was a kid, had a hobby with making balloon animals, and I remember trying it out, myself, back then. I really suggest you check them out, they're pretty awesome.
EDIT: https://latexbones.tumblr.com/ They made another tumblr, this time for balloon animal skeletons. They note that they only use balloons to make them - no adhesive, tape, markers for drawing details, etc.
