Mattmo is one of the founders and sponsors of the 'Stichting Gouden Peperbus'. This foundation organises the yearly election of the best outdoor campaign poster. For the 2005 election Mattmo's contribution is a website and the sms voting campaign.

:: National election
During the Week of the Outdoor Campaign (May 26 - June 2) all nominated posters will be displayed where they belong: outdoors. In a nationwide campaing everyone is encouraged to cast their vote for 2005's best poster.

:: Night of the Outdoor Campaign
In the Night of the Outdoor Campaign, June 1st 2006, the winner of the beste outdoor poster 2005 is announced. Two weeks in advance the voting ballots on the website and sms are opened.
Mattmo has taken this initiative in collaboration with Foote Cone & Belding and JCDeceaux.