In terms of edibles, rye, rice, cattails, watercress, arrowhead, pecan, honeysuckle, and mints would do well along a creek. If you are looking for medicinal plants too, fleabane, water hyssop, and sedge would be good choices. Also, if you remove or thin the brush on the banks, make sure to replace a fair bit of it with other more useful brush so you don't have erosion problems during floods.