Originally Posted by mr dave

in the same vein as this, where you're looking for harsh tones you might be pleasantly surprised by what running everything through a wah pedal does also (especially coupled with fuzz). just don't funk it up, use it like a tone filter. cheap flangers coupled with harsh gain also work really well for creating unique noise tones.

also, again this only applies for making 'noise', hit your local pawn shops and start collecting cheap guitar effects. anything that can be run through a 1/4 inch cable can be run through a guitar stomp box. it may not sound pristine (and not something normally recommended to most) but for noisier stuff it's a cheap method of collecting lots of tone manipulators.