Got a Norns only a month ago, crammed to learn everything about it. Came up with an app which implements a circular sequencer, quantized to clock, multi-voiced synth drum engine with added pad-sound for chords in harmonic progression, parameter mapping, midi editing for the notes in the chords, file saving for multiple sequences and chord collections, softcut based ping pong delay, as well as two softcut loopers synced to clock as well and a few other features(playhead can move backwards/forwards, multipaged GUI, etc.).
Most grateful for this most gracious meta-instrument.