PARIS — The joyful collection Viktor Horsting and Rolf Snoeren showed for spring was their most fully realized ready-to-wear collection for Viktor & Rolf thus far. They used an earth-angel theme, incorporating some of the lavishness of their couture efforts, with lots of pristine white, often boxy dresses, coats and jackets. Here, their innocent little dress, liberally detailed with bows. For more on Paris, see pages 4 to 9.