This is where I was going with my dark steel grey muddling. The next lot of beads I tried used white for the core. If I’d been thinking clearly I would have done that first! They have various layers of scrollwork in hades, tuxedo and white. I made a kalera with an effect I rather liked by doing tuxedo scrollwork on the white, then encasing it in dark steel grey, then white scrolls and hades dots on the surface. Having tuxedo inside like that essentially gives you dark shadowy grey scrolls under the surface, since tuxedo is less dense than hades and not purple like Effetre black. (The thicker your encasing, the less noticeable it will be under the dark steel grey though).
For my FHF Secret Santa gift I made this necklace. It has a kalera like the one mentioned above, plus some spacers to go with it. I strung it on one of Diane’s silk strings (SowZerE) and paired it with small sterling silver beads and findings, plus a hammered ring. The sterling beads are tight enough on the silk string that they can be used to space everything out without any knots.