Mine’s pretty simple:

## .bashrc
export BLA=$(tput setaf 0) # Black
export RED=$(tput setaf 1) # Red
export GRE=$(tput setaf 2) # Green
export YEL=$(tput setaf 3) # Yellow
export BLU=$(tput setaf 4) # Blue
export MAG=$(tput setaf 5) # Magenta
export CYA=$(tput setaf 6) # Cyan
export WHI=$(tput setaf 7) # White

export BOL=$(tput bold)    # Bold
export ITA=$(tput sitm)    # Italic
export UL=$(tput smul)     # Underline
export NC=$(tput sgr0)     # No color & format

_branch() {
    local branch=$(__git_ps1 "%s")
    if [[ -z $branch ]]; then
        printf "${BLA}null${NC}"
    else 
        printf "${CYA}$branch"
    fi
}

PS1='.\[$(_pwd)\] \[$BLA\]〜 \[$MAG\]git\[$BLA\]:\[$(_branch)\] \n \[$NC$CYA\]\! \[$MAG\]\$ \[$NC\]'

## .inputrc

set vi-ins-mode-string \1\e[34m\2.INS
set vi-cmd-mode-string \1\e[33m\2.CMD