Here are a couple choices:
https://www.forumthemes.com/demo/vbul...php?styleid=26 Mechanical
https://www.purevb.com/demo/forum.php?styleid=69 DarkCore
https://www.purevb.com/demo/forum.php?styleid=58 Sozialize
https://www.completevb.com/demovb4/forum.php?styleid=88 TwistedRed
https://www.completevb.com/demovb4/forum.php?styleid=22 BlissfullySimple
But you are free to suggest your own! Ones that I like I will add to this list for people to browse. I want to pick a theme that people will agree on, which is why I'm making this thread.
My current picks: Mechanical and DarkCore. I really don't like BlissfullySimple.