Best black ink with flair? Interest? A little surprise?

I'm looking for black inks that have a bit of flair, interest and maybe a suprise. I quite enjoyed Good Tidings from the Diamine Black Inkvent calendar so think of something similar like that. I want blacks that either have a very noticeable sheen or maybe really sparkly shimmer. Basically, I'm searching for dark inks for work that make people do a double take but from a distance appears dark. Black preferred but open to dark blues with something extra about them and also deep dark purples/burgundies. Any recommendations?

Thank you all in advance :-)