This is a rubric that I designed and used after teaching a rhythm unit with students in Grades 5 and 6 who have had limited experience with rhythms.
Students create a 16-beat rhythm composition using at least 5 different rhythms. They clap and say the rhythms for the teacher and then perform it on a rhythm instrument of their choice.
Check out my Music in the City blog for a more detailed lesson plan. http://musicinthecitylv.blogspot.ca/