Interior decorator Summer Thornton believes in designing with the wildest abandon: her world is one of nickel tubs, marble fireplaces, whimsical textiles, surprising patterns, and secret gardens. Often described as maximalist with a modern, fresh sensibility, Thornton manages to achieve highly polished, sophisticated interiors that indulge in a lighthearted, almost irreverent sense of whimsy. In her first book, she will inspire readers to follow their creative impulses and make their own rules.    Let yourself be transported with the dreamy, fantastical homes arranged by theme in Wonderland. “Fearless Romantic” features Thornton’s own gorgeous city house. “In Here Comes the Sun,” peek into an over-the-top tropical vacation home that’s centered on citrus. Look for her to misbehave a bit in “Good to be Bad.” If refinement is more you