This paper reports the findings of a pilot project, Open Resources for English Language Teaching (ORELT), that aimed to introduce open resources for teaching English in Kenyan junior secondary schools alongside the traditional textbooks that until now have been the only teaching resources available to teachers and learners. The ORELT materials, which consisted of open content in the form of DVDs, books, and online content were developed by the Commonwealth of Learning (CoL), Canada, for use throughout the Commonwealth of Nations. Before the rollout of these materials, English teachers from selected schools were enlisted for an in-service workshop where they were trained on the materials and the concept of open resources, and were given a hands-on familiarisation with the resources. Two ORELT workshops were conducted for four days each between 18-21 March 2013, and 6-9 May 2013 at the Kenyatta University Conference Centre (KUCC). Participants of the first workshop were drawn from secondary schools within the urban and peri-urban areas of Nairobi. Participants for the second workshop were drawn from rural schools. This article views the introduction of these open resources in Kenyan schools as an educational innovation and investigates the effects of such an innovation on teachers' pedagogical practice. The study found that this innovation had a generally positive impact on the teachers' pedagogical practice in terms of their pedagogical content knowledge and skills, teaching methodology, and professional growth.