Texas Beyond History, as well as being an excellent site for general purposes, also has lesson plans, keyed to TEKS from the categories
A Day in the Life
Students explore the roles of a variety of people who lived or worked at a nineteenth-century Texas frontier fort or in a nearby frontier town. By writing about a character in his/her own voice, students reach a greater understanding of life on the Texas frontier. Suggested for grade levels 4-7. View TEKS and download page.
Archeology 2500: Texano Weapons
Students work in small groups to write a creative, descriptive report about a "mystery" artifact. Hypothesis building and creative writing suitable for upper elementary and above. Suggested for grade level 7. View TEKS and download page.
Making a Caddo Circle Book
Students write, draw, and use mathematics to create a short booklet about the Caddo Indians. This interdisciplinary lesson is suitable for grades 4 and 7. View TEKS and download page.
Aldridge Sawmill - The Story in Numbers
This lesson plan provides 7th-grade students an opportunity to practice math skills while becoming familiar with Texas' "Boom & Bust" economy and the natural history and geography of the east Texas Piney Woods. The student handout is illustrated with historic photos of logging in East Texas. View TEKS and download page.