For some light Holiday infotainment I've been enjoying "Stadt der Commonisten" ("City of Commonists") by Andrea Baier, Christa Müller and Karin Werner.
Effectively it's a Photo-Collection covering many aspects of DIY-Activism such as Urban Gardening, Guerrilla Knitting, Open Workshops and so on.
Many of the pictures are utterly charming.
The book is now out of print, but there's an open access pdf available, here:
Klick on the Open Access CC symbol and download.
Don't worry about not being able to read German, there is little text and I guarantee you'll be inspired by at least a couple of the Projects presented in the Photographs.
The small amount of text is largely a collection of DIY-Activist terms, I guess that could be fun for someone learning German and wanting to extend their vocabulary in that direction.