A good majority of Dir En Grey's music videos have a guro imagery in it or the songs have grotesque meanings behind it , like "Obscure" for an obvious example.

This video has everything: Vomit, robots, impalement (spike & strap-ons), cannibalism, bloody org, heart exposure & the list goes on.
https://www.youtube.com/watch?v=oUtKNtJlUM4


"Different Sense" for tentacle porn fans
https://www.youtube.com/watch?v=RrsQLFPn93g


There's probably a few more around, but those two always come to the front of my mind when thinking of guro music.