Google has a "Museum of Abstract Borgmon Art", and I've replicated it everywhere I've installed Prometheus/Grafana. The shape of some of the weird things I've seen can be really revealing - and getting familiar with them has educational purposes, too, in terms of diagnosis of service (or even sometimes monitoring) issues. Mostly, though, it can create beautiful and interesting pieces; the smooth waves of diurnal user traffic intersecting with the sharp triangles of batch processing, the staccato ticks of rare events, the jitter and chaos of rates too zoomed in.