Create a lesson around a mystery "whodunit" detective crime in the language being studied. Start with a short story that explains what crime has been committed like a famous painting has been stolen.
Create an area on the class website that allows students to post questions about the clues and to respond to questions posted by other students, all in the foreign language being studied.
Create an area on the class website for students to post their answers. Decide whether other students will be able to see student's answers and whether they can respond to a classmate's answer.
Play the role of the thief and send out daily clues, in the foreign language being studied, to the detectives (students) by email. Emails should include clues about the thief's identity, location and where to find the stolen art work. Have the thief's location change daily, exposing students to a variety of foreign language sites.
Center the clues around the lessons by having students explore websites in the language they are studying and search for answers. An answer might be hidden in the history of an artwork or in information about the location of the artwork.
Have the detectives post their daily findings to the website, in the language being studied, and grade according to how well they respond.