Harmonic features - an idea from music therapy
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Here the idea is that each number of beats per measure is assigned a pitch, so e.g. 7 beats to the bar corresponds to the seventh harmonic, 5 beats to the bar corresponds to the fifth and so on. This works particularly well with polyrhythms, with the harmonious sounding polyrhythmic harmonic metronomes.

The results sound harmoniously together as they use pitches from the harmonic series. You can shift all the notes into the same octave if desired (as harmonic series notes may be spread over several octaves).

You can also play Theremin's rhythmicon which generates interesting and harmonious polyrhyhmic pitched rhythms.

Then for something more exotic you can also try out the fractional beats per measure, including the golden ratio rhythm which combines the most polyrhythmic possible rhythm (in a certain sense) combined with the most inharmonic possible musical interval (actually a pleasant interval to listen to, just not related to any interval in the harmonic series).

To find out more see Harmonic, Fractional Harmonic, and Rhythmicon

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