Angry verbs -- creative writing activity: This was used in a second grade classroom, but there is no reason it couldn't be modified to teach upper grades similar things. Angry Verbs, Angry Adjectives, etc.
Resources for teaching grammar! Wouldn't this be a cool addition to the classroom, a book that has songs about grammar! You could sing a song each week and try to get it stuck in the student's heads so they begin singing about grammar too!