Can anyone help me think of a creative name?

Our middle school homerooms have developed a "house" system similar to the one used in the Harry Potter movies. Just like in the movies, the "houses" compete against one another using a point system. Students can earn merits/points for doing good deeds and following rules. All points go to your house. Students can also receive house demerits when they are found not following the rules of the house. The goal is for the students to keep earning points and not to lose them. We hope to improve overall behavior and boost students self esteem. Can anyone help me think of a good name for our house based on this goal and use the color green in the title? It is our house color. Any suggestions would be greatly appreciated. :0)