I often use Pools on an Aux send for some sweet reverb. Fully wet.
Wrms, Bounds, Glitchlets, B-B-Beat, really any of the loopers or delays are killer. Having the built in reverb for any script is also very useful and easy.
I use that little SSL mixer and run one of the aux sends (stereo) to the inputs on Norns and run the output to another stereo channel. I can quickly send any channel to it and bring the loops in and out as needed.