The
Pokémon Style (ポケモンスタイル) app has made a new wallpaper and icons design based on
Pocket Monsters Black and White and it features N and Gym Leaders. The app is free and themes can be purchased in the app which can be used by Android and iOS users in Japan.
Source:
http://www.pokemon.co.jp/info/2015/04/150424_pc01.html