I read that the best refeed is a day of low-fat, high-carb foods. Start with simple carbs and switch to starchy carbs. Also, fruit isn't allowed. The reason that refeeding seems to work for people is because it raises leptin levels. Whenever you loose weight, your leptin level goes down, making it harder for you to loose weight. A refeed is supposed to up your leptin.
I have been on a stall for about 2 months now and I haven't tried a refeed day yet because I am going to start to up my exercise and see if that helps. But, I think I will try a refeed at some point. I'll post how it goes.