Something cheesy, but less cheesy than the cheesewrought instabold, would be to use a house rule found in Unearthed Arcana on page 68 in a sidebar. Druid gains a domain from this list: Air, Animal, Earth, Fire, Plant, Sun, and Water. The Animal and Plant domains also give skill focus (knowledge: nature) and Sun domain actually gives turning 1/day instead of greater turning. The druid does not "trade in" anything.