So I was right. I suspected that the knitters that did this Yarn Bomb were mädels. I was right! You’ll note in the comments of that post, I was mysteriously directed to this site: http://rausfrauen.tumblr.com/
There, much to my delight, I saw more images of yarn bombs, penis shaped Oktoberfest Lebkuchen and an Ubahn seat which had been adorned with Oma-style curtains.
I don’t know who the Rausfrauen are, but I like their style! Read their manifesto here.