These are by university students. This site has thematic units that I have not listed on my theme pages. Most appropriate for Preschool, but could be used for ideas with primary. These units are part of the site of Lincoln School in Springfield, IL Gander Academy's Theme Related Resources on the Web Lists WWW resources for young children and elementary teachers by themes. There are over 40 theme pages that will provide instant risk-free access to resources that teachers can use to prepare classes and online activities and students can use to help research a topic.
Many pages contain links especially for teachers.
Each theme has many useful resources listed. This Canadian site lists many learning objectives and strategies to teach them. Interdisciplinary Lesson and Unit Plans Has mainly upper grade units, but they are extensive and very thorough. All emphasize activities which involve the arts. All provide activities which integrate the arts into the theme.