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I've often thought about this.

Currently, our sole way of manipulating spacetime is by cramming a heck of a lot of matter in one spot, which is to say that we don't really do much of it. Any way short of crushing down mountainsful of matter into a thimble would necessarily be more complex, with more moving parts. I can only think that rotation would come into play, and if one dimension is good, three would have to be better if you want to shred spacetime.

I don't think it's doable but in the sense that you want something to visually convey it, it may as well be the equivalent of lightning to stand in for electricity.