Thanks for the recommendations above folks!

@cmb_ is correct, I am presently more interested in "chaos" type modules which are different from random. The Elby link / description above is good. Put simply, chaos module outputs are less patterned than LFOs but more patterned than random.

The Nonlinear Circuits chaos modules are particularly interesting to me (https://www.nonlinearcircuits.com/modules?tag=Chaos). I'm going to get Triple Sloths. If people love/hate the other modules, I'd be interested to hear which ones and why!

In the meantime, I'll continue to check out the recommendations above, most of which I'd never heard of before. Thanks for the ideas everyone!