no, it's basically anything out of your norm that would be "carb heavy." And, it doesn't have to be a massive binge.
in my case, refeeds are mostly rice (1/2 cup cooked or less in sushi, etc) or sweet potato (1/2 med-large sized). It's not much, you know? but it bumps up the calories and the carbs, and seems to reset my system nicely. I'll do this for three or four weeks (once a week), and then have 6 or 8 weeks without anything -- maybe more.
it's a nice little cycle.