The agency will be expected to drum up publicity around two new services.
TeenzVoice aims to give young people platforms to air their views, while the Black Male Forum aims to provide young black men with opportunities to improve their personal development.
The PRactice's campaign will draw on music, fashion, entertainment and celebrity culture, targeting national, ethnic-minority and music press.
TeenzVoice will cover three strands. The first is a writers' club which the agency will promote to young people through teen titles, and to their parents and teachers through broadsheets.
The second is a discussion forum, Soap Box, which will be mediated by celebrities such as Meera Syal and take place at events throughout the UK. Participants' views on topical issues will then be fed to the press.
The third, Clash of Sounds, is a Pop Idol-style contest featuring genres of music from opera to bhangra, whose winner will receive a recording contract. PR for the competition will target the tabloids, plus trade and consumer music press.
VOIS, which has been running for 18 months as a trial project in London, will roll out its activities nationwide.