found-material self-portrait project article - I would also look at artist's who have made portraits in alternative media and discuss how media can define contextual readings - look at Janene Antoni's 'Lick and Lather'
High school art project
Kozmic Dreams High School Art Lesson Plans
Luca Nava: self portrait, collage e matita su carta
Milwaukee High School of the Arts - 2009 Visual Art Selections
The Blooming Palette of High School Art: Inside Out (High School Art Unit Plan)
Visual Journals and Altered Books and 100 Journal Prompts to get you started!
Non traditional portraits
Artsonia Art Museum :: Artwork by Stephanie grade 11 painting Self portrait showing emotion, a great project for teenagers to explore self identity