In this blog post, a teacher shares ideas for projects on Mesopotamia, but with a twist. The projects are all categorized by multiple intelligences. This is a great tool for ideas for students who learn differently.
It's so important to use primary and secondary sources when teaching history. This is a very comprehensive list of both organized by civilization. You could have groups of students choose a civilization and share one or two sources with the rest of the class.
Looking for a complete unit on Mesopotamia? Here it is! This is a very well designed unit of instruction appropriate for middle school students. Or, you could also pick and choose from the many activities in the unit.
The Ducksters website is a great place to look for information on a wide variety of topics and subjects. In this case you will find a summary of the basic facts about Mesopotamia and links to much more information.