Use like "Caught Being Good" tickets. Maybe write "Habit: so I can circle which habit. Or just keep it general! Or, -- circle the number and the kids could have a 7 habits "BINGO" board and get a reward when all are filled.
The Cat in the Hat Knows A Lot About That - The Rainbow Song. My younger students love this. They never forget ROYGBIV after learning this song. They like to sing it while waiting in line to change classes.