Such a sweet idea for teachers to do in their class! Classroom B-day idea... or just a great community builder mid-year. This is seriously one of the sweetest ideas I have ever seen. If there is no smartboard in your room maybe you could do it with large bulletin board paper. Then they could keep the kind words.
Try something new during these last few weeks of the school year. It can be like a dress rehearsal to see if you want to blend it into your "teacherly bag 'o tricks" for next year. I like this education infographic from the amazing Mia Mac Meeken.