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 Light
MT MODERN THEME

A sleek and modern SCEditor theme

io Theme is a minimal, simple and free MyBB theme.

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

Responsive Modern Mybb Themes 1.8.29

Responsive Modern Mybb Themes
A nice looking version of defult MyBB theme, created for a Polish Minecraft server board.

Just simple theme without many custom, just only some and very responsive

It's simple and clean MyBB Theme, feel free to use it.

Classic Blue is remake of a old theme TheTechGame.com used back in 2011. This theme is a nice white and blue theme for almost any type of forum.

Customized, siplified, modernized version of default theme

Just another theme based on default theme

Duende V3 - Fully responsive, tons of improvements

Emre KRMN vBulletin default style theme for mybb 1.8.x

Default theme but more contrast, mobile friendly, spacing between posts; free of banners etc
This theme is based off of the Wordpress theme Frontier.

My first topic for the MyBB forum.

Updated version of Audentio GamingJam theme.

A MyBB GitHub like theme

Simple and clean theme with 5 different colours