I’ve heard some people like to play with weird plastic contraptions between their fingers to pluck the strings.
I think the Kliq bass strap with aircells is pretty interesting. But probably not weird enough.
I’ve noticed an increase in LEDs on bass fretboard and such, but don’t think they serve much purpose besides aesthetics unless you are playing in the dark?
This thing is pretty interesting/weird but Scott has already done a video on it if that matters. https://www.bassmute.eu/bm_mainframe.html
Main gadgets I’m currently looking into are pedals, but I’m guessing that’s not what you are referring to.