Zsh prompt change color if normal/root user

zsh-prompt.sh

# This GIST should go inside your .zshrc file
# I use same .zshrc for normal and root user, so it's useful to change colors
#
# It will present PROMPT as: username@hostname dir $ or root@hostname dir #
# username on green chars
# root on red chars
# hostname on bold yellow chars
# directories on bold green chars
#
# RPROMPT should show a clock on the right 
if [[ $EUID -ne 0 ]]; then
   PROMPT="%{$fg[green]%}%n%{$fg_bold[white]%}@%{$fg_bold[yellow]%}%m %{$fg_bold[green]%}%1~%{$reset_color%} $ " 
else
   PROMPT="%{$fg[red]%}%n%{$fg_bold[white]%}@%{$fg_bold[yellow]%}%m %{$fg_bold[green]%}%1~%{$reset_color%} # "
fi
RPROMPT='[%T]'

note that instead of having the whole if block you can do stuff like:

PROMPT='%(!.%F{red}.%F{blue})%m'

same deal for $/#: %(!.#.$)

documented in section 13.3 Conditional Substrings in Prompts of the zsh manual.
Have a good day!