Check this: http://dribbble.com/shots/648832-Background-for-the-LinguaLeo-app-windows-phone-version?list=68977-LinguaLeo
Free app on the Marketplace: http://www.windowsphone.com/ru-RU/apps/fefe0d5d-5083-4a0b-a7f5-d6ed604c4807
