Participatory design methods have the potential to produce ethical and useful persuasive technologies, particularly in support of environmental sustainability. I present the use and results of ethnographically-inspired methods, Cultural Probes, and the Inspiration Card Workshop to generate concepts for new persuasive technologies for use by a college EcoHouse. Keywords Participatory design, persuasive technology, environmental sustainability. ACM Classification Keywords H5.m. Information interfaces and presentation (e.g., HCI): Miscellaneous. General Terms Design, Human Factors.