I have implemented these coloured faces into my behaviour management routine.
I have the faces lined up with the green smiley face at the top, then the yellow face, followed by the orange face and then finally the red face.
All students have their name on a peg which starts at the green smiley face each morning.
Students receive one verbal warning. If I have to warn them again, their peg moves to the yellow face. If I speak to them again in regards to the same undesired behaviour I move their peg to the orange face and they are isolated in the classroom. If their peg should be moved to the red face, they are removed from the classroom and sent to the office.
Obviously you can modify this to suit your classroom or school's behaviour management policy.
*UPDATED: I have now added black and white faces to this file.
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