Caterpillar Rhythms is another variation on the popsicle stick rhythm activity, and allows students to create rhythms in whatever time signature and have them practice in small groups. Could make this a competition, my kids thrive on that.
King's Music Room: "Hear it! Clap it! Write it!" Grade Rhythmic dictation activity using worksheets. Print the activity and cover in laminate to use of dry-erase markers and allow the sheets to be reused
Music Monsters (or quiet critters) each student grabs one on their way in the room. Take it away if they are not meeting expectations. Students who still have their monsters at the end get something special (stamp?