Comixene, the oldest German magazine about comics, is no longer being published. If you visit comixene.de, however, you can link to Becker Illustrators, a site that indexes the work of numerous German illustrators by genre and style. Not only can visitors to the site learn a lot about the current scene in Germany, they can also view a treasure trove of culturally-authentic images for use in all levels of language learning. The pictures lend themselves particularly well to teaching culture.
These are just samples: many more genres and illustration styles available on the site. The site is so rich that even a web quest or independent project might be a possibility.