Most organisations build a small amount of expenditure into their projects to cover publicity costs.
The Publicity Manager in ESF Division can advise you on publicity requirements and supply examples of promotional merchandise:
Email: lynnette.keller@dfes.gsi.gov.uk
You can also get a wide range of information leaflets and posters from the European Commission at their UK representation in London. Most of these materials are free, but some have a small cost.