Not sure if it classes as bling or not but, I love the engineering look and weight (lack of) on the X01 12sp cassette and also the 11 speed Garbaruk with frame colour detail matching large ring.
Both work perfectly and I don’t think I’d call them bling as such, more quality that happens to look good.
Personally I’d class bling as the rainbow coloured cassettes from Alibaba etc as they look funky but performance – who knows?
Ultimately whatever you associate as bling on a bike intended to be used in all sorts of weather and ridden hard off road is probably just a sign of more money than sense. Does make me smile in appreciation for my bikes now I’m an old git though, so meh to that last statement 😉