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.
Teaching Elementary Music: Build sol-mi-la songs that children know. Put 4 beat phrases on sticks. Use color-coded sticks for the different songs and let students work in groups to put sticks in the correct order to reconstruct the song.