Take a look at my bio page, and see the link I have to my Indulgence Diet. This works kind of what you're looking for. The thing is, you have to be really careful that you don't go too much over board on the day off - you really don't want to cancel out a whole week's efforts for one day of slacking.
Sure, you can have a day where you "go nuts". But you can't lose grip.
I hope it helps.
"Keep your friends close, your enemies closer, and the cookies at the other end of the table."
"Eating less, moving more, not eating stupid s**t = losing weight."
"Do. Or do not. There is no trying."
- Master Yoda.
I started my weight loss journey on October 4th, 2010 - and this is what I have accomplished so far: