Creativity and innovation emerge as fundamental requisites in terms of design and development of present-day user interfaces. While conventional user interfaces need to ensure usability, less conventional interfaces additionally require creativity and innovation. In order to nurture these elements throughout the process of design and development of novel user interfaces, the author proposes the use of the BadIdeas 3.0. The BadIdeas 3.0 method initially focuses on the generation of bad ideas, which are then submitted to a critical examination. This examination subsequently results in a more convergent analysis of the bad ideas. Later in the method, these ideas are transformed until they are of good use and have materialised into a tangible artefact or idea for future implementation. This paper presents the BadIdeas 3.0 method in full, explaining its structure and providing guidelines for its use.