Try any sort of hard solid debris. Ground slide, brick debris, rock debris, demolition sounds...
For the most time (actually always, when you don't know that you need to add a chorus or a granulizer or something), limit yourself to thinking only about pitch shifting and cutting processing-wise. Limit yourself to what a basic digital sound sampler does. If those don't seem viable or cannot produce anything that ticks, the sample or recording in hand is not what you're looking for, so move on.
Spend more time on recording or listening through samples than expecting a plug-in/a DSP process to make something work. This works almost every time in something that wouldn't have to be clearly "processed" (e.g. granulized), at some point you'll notice something that works and you'll very likely find it faster than by playing with plug-ins and the wrong samples.
Think backwards from the "expected goal", rather than forwards to a goal. Why your "goal" should result in one way, but not the other? What practice and use of your time makes most sense for a given task? Found a recording that fits exactly? Then use it and move on.
Spend more time on listening to samples or recording them.