On OSX it's actually pretty easy to get a colour prompt.
from your home directory, edit the following (in terminal)
Mine looks like this:
export PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "
alias ls='ls -GFh'
You can customize the username/directory prompt by changing your PS1 string, the website below is what I use to make it:
Props to Kclawl for showing me that site, wherever he is