I've made a device chain that automatically morphs between a shrill 1/8th delay and a mid-range 3/16th delay - in time with the mooosic.
Here's how:

As the autoPan slowly shifts between the left and right channels, it alternately feeds the slow and the fast delays - the utility plugin is there to bring everything back into the centre of the mix.
It has this interesting evolving, filter-sweepy sound to it. Very good for dub and all that, I guess. Switch to a more drastic waveform and this will totally change the rhythm of the input.
If the sound you're feeding into this chain is very wide, you can of course use a second utility plug in front to even things out.
Have fun!
Andreas