New materialisms have informed an array of creative methodologies, inviting scholars to rethink ethics in the practices of research with children. Participating in this rethinking, this study elaborates on ethical practices in creative research where new materialist and arts-based methodologies intra-act with children and the sensitivities of gender and power in young peer cultures. Drawing on experiences from the authors' creative workshops, this paper investigates how new materialist creative practice allows children to explore and communicate their experiences of gender and power in safe and enabling ways. The authors suggest expanding their ethical practice by composing ethically sustainable encounters for children to engage with experiences of and visions for their peer cultures. They close by discussing practices for responding to the inherent un/safety of addressing gender and sexual abuses of power and for enabling microprocesses of change to -- as a matter of sustainability -- transform oppressive peer cultures towards social justice.