Realistic cracks, crevices and chasms

I beseech the great community to help me with a big problem. I am currently creating a dungeon map based in a cave. However, I'd like to put in some realistic chasms/crevices around the floor and have a broken bridge nearby. I originally thought of doing a fractal shape with crack or line fill but it looked terrible.

How have you created your chasms and crevices and how realistic or at least passable are they?

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