Teach Like Me
Here are links on this blog specifically about teaching writing–mostly creative writing–to high school students.
Exquisite Corpse (examples here)
Sound Poems (starting with pre-word sounds)
Poetry Bingo (select words randomly, make into poems)
Introducing Rhythm in Poetry
Magpo.com assignment. (uses magpo.com)
Creatively Translate a German poem into English, with revision ideas (some from this book.) I believe I read someplace that John Ashbery has his poetry students do a similar activity.
A “Creative Writing 1” course calendar from 2016
Concepts of Creative Writing
“Teaching Writing” category listing.