There is no such thing as industrial samples... well at least to me. I do elektro-industrial/noise/powernoise and some EBM.
What I suggest is thinking of creative ways to screw up sounds. That's the great thing about industrial, free reign to experiment with the ugly/harsh/nasty side of things.
Sometimes even the simplest thing can screw up sounds so much that your chin falls to the floor. For example, if you have any modern sequencer that can do time-stretching on the fly w/o affecting pitch, take a 4 bar drum loop and stretch it to cover 32 bars. At these extremes it starts breaking up, or turns into a breathing, heaving organic mess that's still cohesive yet sounds nothing like drums.
BitCrushers and Aliasers (sample dividers) are also handy, specially if you modulate the sample divider's frequency. Check out my tune "Disembodiment" to hear BitCrushing and modulating the aliasing point to good effect (go to my soundclick page in my sig, it's the second tune from the top).
Use ring modulators on drums where the modulator's frequency is tuned pretty low to give it a rhaspy sort of sound (again I use this in Disembodiment).
In many ways, if you can create harsh sounds w/o really using the obvious distortion pedals/distortion plugins you develop some very interesting sounds that can't be done other ways. For example, take some compressor (hardware or software) that responds well to being driven hard, and crank up the sound before it reaches the compressor, drive it to bits and pieces, and pull down its volume before it gets output from the compressor, the idea is you want to distort it inside the compressor. If you use plugins the ones that operate at 64bit internal resolution usually work the best.
Same goes for EQ. Again abuse it.
What I'm recommending is stuff that you do at sound design stage, you might for example use the compressor distortion method on some sample, then load that into a sampler and play it.
Since you're a guitar player, I'm sure you've got some stomp boxes laying around. Connect them in some strange ways, even using "Y" connectors to create feedback loops, then play with the knobs on them... do this during the day time, turn down the level on your monitors and wear earplugs while experimenting in this manner. And if you smell smoke, disconnect everything
But sometimes the feedback mess that you get can be very organic sounding. So mic it up, sample it, load it in your sequencer and have at it.
