Sometimes, you want more than your average echo. You want a bit more texture, something to tease the ear of your audience and encourage them to go back and listen again. What exactly WAS that in the background? Was it supposed to be there?
At its heart, Glitchmachines' Hysteresis is a delay. However, this delay also adds a low pass filter, modulation, and a stutter. Put it in a return bus, adjust the width a little, and experiment. Your echos will sound like warped, mutated, corroded versions of themselves. And this plugin, like its sibling Fracture, is free!