Students have a blast writing in their own rhythm patterns for every hour on the clock and then seeing if they can keep the beat going all day long! Works great with the rhythm backing track here: http://funmusiccoimages.com/files/rhythmclock_back... Read this blog post for more information on how to incorporate the Rhythm Clock into a piano lesson.
[Thanks to Janice Tuck of the Fun Music Company for inspiring me with her rhythm clock game.]