This is Mr. Yen's color zone. I have also added an input to adjust the sizes of each box. Mainly targeted for MES and ES.
The default settings are as he describes:
white line is the previous day close red zone = +/- 20 from the previous day close yellow zone = +/- 40 from the previous day close green zone = +/- 60 from the previous day close blue zone = +/- 100 from the previous day close
The source code is open, so feel free to take a look and see whats up. This indicator is quite similar to his, however there is a gap at the cash close to overnight open on his chart that I'm not sure how to adjust for. In any case, this one is still pretty good!