UPDATE 1/3/2011: The newest version of Glimmr Automap (v3) is now available, with image assets, as part of the full Glimmr release archive (get it here), and should soon be available from the Inform 7 extensions site. The Automap zip archive mentioned below has been withdrawn.
It seems that the zip archive I posted last week for Glimmr Automap was missing some necessary image files in the automap tileset. A new archive has been posted on the project’s Google Code page. Get the updated archive.