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 Responsive

Roundo-Darko is a dark version of the Roundo theme. This theme gives a dark, modern, responsive look to MyBB.

Roundo gives a new modern look to MyBB. This is a modern, flat, minimalist, responsive theme that can be used for free on your forum.

Duende V3 - Fully responsive, tons of improvements

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

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

Elegant, General dark and light theme for mybb

A basic Responsive MyBB theme using Bootstrap 3

The responsive version of MyBB's default theme with mobile friendly and with new look .

Fully-responsive, elegant, Bootstrap-driven MyBB theme

Responsive Modern Mybb Themes

Responsive Modern Mybb Themes

A flat and simple responsive premium theme for free!

Responsive Modern Mybb Themes 1.8.29

Default theme but more contrast, mobile friendly, spacing between posts; free of banners etc

MyBB Default 1.8 theme responsive (css grid)

Responsive Modern Mybb Themes

Lightly designed theme. Simple and fast.

A flat and simple responsive premium theme for free now!

Dark and responsive theme for MyBB 1.8 by Marihunaen.

The Agood theme was designed for MyBB 1.8.21+ series.