Diffmix is a project within the framework of the European Capital of Culture Esch2022. Citizens were invited to mark places in the municipality, where invited artists will create interventions. The briefing was to create a tool for the citizens that allows them to appropriate the project’s communication. Due to the diverse users, we had to come up with guidelines that are flexible enough to work in various DTP software and on different operating systems. We created a Design-kit which includes templates, best practices and rules to guarantee an overall look and feel of the project.