Watch Dario Argento's films - Profundo Rosso, Suspiria, Inferno, Tenebrae. Those should all be quite easy to get hold of. Then start in on this list... https://en.wikipedia.org/wiki/Giallo

Suspiria in particular sticks in the mind. Great music, saturated colours, properly horrific horror. It's a bit more 'on-screen' than BSS, btw.