Add character to a plain wall with trim, baseboard and molding details. I've seen this done and it's amazing how realistic it is! Unless you touch it and feel the drywall between the mouldings, you would never know that it's not a full paneled wainscot!
Box Tops Pizza Party contest. Each pie is a grade, then the slices are the different classrooms for that grade. Classroom gets a pepperoni for each 50 points submitted. Teachers loved this when working with fractions in their class. Inexpensive board. just poster board, round stickers, & some printed name tags. Super simple to update too!