Creativity techniques are tools for stimulating creative thinking. The importance of creativity fostering techniques in software development has been recognized and investigated by researchers for over a decade, yet the greater software engineering (SE) community makes little use of the myriads of techniques available. In order to encourage a wider adoption and to support the use of creativity techniques in software development, we have reviewed a large number of creativity techniques and have created a Creativity Patterns Guide. This paper describes the part of the guide tailored for the requirements engineering phase. The guide has been evaluated in real-world projects.