So the ppt I posted earlier is fantastic! However, my best idea yet has been to use our infamous technology! Since we are a Google campus now, the kids have unlimited access to share docs and work on them in real-time. I created a Google doc for 7 groups in each class period. I shared this doc with the students. They worked in groups of four to create a "Rules" sheet. I gave each group the task to be principal for a day (good or bad). The groups created 2 Hay que and 2 Se prohibe rules for their school. They worked on these simultaneously and had so much fun adding graphics/pics/etc. I hung them in the hall after they finished. This took only 1 day. If they didn't finish, they accessed the same files at home and worked on them there. :)
Click here to view the actual Google Doc. Enjoy!