Themes offer an interesting way to integrate lessons and give students more in-depth opportunities to pursue learning. The following sites contain a variety of ideas, but are best used as a starting place for your own ideas.  You should adapt them for your classroom as some sites are too simple for some learners and overly complicated for others.

General

Exploring Themes in American Art 

Preschool Themes and Lesson Plans 

Teaching Citizenship’s Five Themes 

Themes 
For those in primary

Themes, Motifs and Symbols
A must-read article about themes and discipline

Themes:  The Children and Armed Conflict Unit 
From the United Nations, suitable for middle and high school only

Primary level themes, all subject areas

ChildFun 
Young children’s themes in alphabetical order with a lot of nice printable coloring pages

Grades 3-5 Themes 
Science and social studies

Monthly Themes 

NASA’s Solar System Exploration

Preschool Themes -- 107 Early Childhood Education Themes

Special Themes

Teaching Themes

Theme Library

Themes and Other Subjects 
Integrated lesson themes

Theory to Practice:  Thematic Learning Environments 
Themes and literature circles