During communicative activities, punch holes in the papers of students that are off task or not in the target language. Easy to keep track of participation when you collect the papers! Or spin it so a hole punch is positive.
Finding JOY in Grade: Classroom Management: The Purple Clipboard. I wonder if this would be hard to maintain accurately all day, might work better in a middle/high school setting for periods than all day elem management. Like this idea.
Sub Tub -- Possible things to include: A Welcome Binder (explaining the daily schedule, where things are in the room and anything the sub might need like computer log-in codes), emergency lesson ideas, great books, games and other activities to do!