In another sense, Crustaceans have been sort of a grey area in relation to effects/fuzz. The modular synth interest notwithstanding, it hasn't seemed really right up to this point. Anyway, here's a noise generator, and in this video I have one modified with an audio input and self oscillation mode:
[youtube]http://www.youtube.com/watch?v=Qmyxk0CUNeg[/youtube]
~3:10 if you want to cut to guitar input.
So, aside from the "malformed" elements, that's a direction I'm veering toward. Though to be honest, as a bypass-able/foot controllable effect there are numerous options I need to consider, many of which would drive up the price or limit functionality, two things I'm trying to avoid. Any way, the standard unit is widely customizable, and if you're interested in such an object I'd love to hear about what would make or break it in your set up.
Some porn:



https://reverb.com/item/2468476-rma-cru ... -mild-rust