Most people who explore various forms of Just Intonation probably try this tuning sooner or later: the first twelve odd numbers interleaved in an octave. A fistfull of superparticulars, all laid out in order. The eight lowest primes. The three lowest odd composites. Even though all twelve stepsizes are different, the overall contrast in step sizes is fairly smooth. It's the same tuning as the 23limit Exact PLOT, just arrived at by a different theoretical method.

Largest step size:  138.57 c  (13:12) 
Smallest step size:  73.68 c  (24:23) 
Number of step sizes:  12 
HC = 19.6
2005 by David J. Finnamore
tuning@elvenminstrel.com