Favorite room in the house to design or decorate?

I love building but I enjoy different rooms for different reasons. I love doing dens/living rooms because I like creating different types of built-ins with bookcases, fireplaces and TVs, I love kitchens, laundry and baths for the clutter - for all of the little touches. And I love outdoor spaces with lush gardens, ponds, fountains, paths and waterfalls