Nice call, Coldblum. Fish en Papillote, to use the technical term. I do the same with a few additions including thinly sliced yukon gold potatoes, roasted fennel, and garlic. Off the top of my head, you could also try any of the following. Capers, squash, cherry tomatoes, raisins, spinach, olives, carmelized onions, currants, carrots, brussel sprouts and more. Thyme, parsley, sage, and dill are all classic herb matches for white flaky fish such as perch and walleye.