Giving your forum an entirely new look and feel is easy — just download one of these great themes! There are even themes for the admin control panel.
Projects in Dark

Fully responsive, modern & multicolor theme for MyBB 1.8 (Documentation included)

MyBB Dark is a twist of the default MyBB theme in that everything is darkened.

Free dark flat theme

Dark and responsive theme for MyBB 1.8 by Marihunaen.

Inferno theme for mybb

Dark Night is a modified dark version of the default ACP Theme

Add a dark color for your Default theme

This dark SC Editor style can be useful for forums with dark themes

BlackPlayers Theme for MyBB 1.8.x.

Darkness Theme for MyBB 1.8.x.

HileUzmanı Teması - ColdFrm 1.0 Güncellendi Sadece ColdFrm da
Purple & Black modded ACP Theme

Mybb Tema DarkBlue (ColdFrm) Güzel Bir Tema Dır Pişman Olmıcaksınız.
Green Noise
by sirev
Green noise theme under blue-grayed backgrounds.

Cheater theme, very basic and my first theme.

Updated version of Audentio GamingJam theme.

A darkness bassed default theme.

Impulse Dark is the sister theme of Simple MyBB Variant Theme