See Oh My Zsh’s repository for more information on that awesome project.
git clone https://github.com/rastersize/oh-my-zsh-themes.git .oh-my-zsh-themes && ln -s ~/.oh-my-zsh-themes ~/.oh-my-zsh/custom/themes
# Then set edit .zshrc and set the ZSH_THEME variable to;
ZSH_THEME="rastersize"
# or if you want the machine’s host name in the prompt;
ZSH_THEME="rastersize-server"