Last year I used the $100 per hour theme throughout the year by giving out $100 bill pencils for prizes for student of the month and for other student achievements and exceptional effort. And I often reminded the students that by giving their best effort in class they are earning $100 per hour in future earnings. This year I plan to extend that by putting $100 bill stickers in students' notebooks and writing them notes recognizing their efforts in class.
Important Note: As an economics major in college I learned about opportunity costs and that is definitely what I tried to focus on during this discussion of money and earnings. I tried to emphasize to the students that money has value in the sense that it represents opportunities.