Raising an old thread I know, but this recently became a quest of mine. I started with a simple google search and came across this post. After reading it, I couldn't take "no" for an answer, so I dug deeper. I found where the default bashrc is stored in Linux Mint 17.3, and probably other versions.
If you open /etc/bash.bashrc in gedit (or you favourite text editor) you will find some lines like this:
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PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\h\[\033[01;34m\] \W \$\[\033[00m\] '
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
They subsequently define the "default colours" of PS1 for bash. The first one is for root (su) terminal, the second is user terminal. Using the guide that's linked above, I tailored my user gnome-terminal window to my liking.
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PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\w\[\033[01;34m\] \$\[\033[00m\] '
This is how mine looks. I just simply changed the user@host to reflect the directory path I am working in, and changed the colour of the font of the directory path to red. As you can see, I left the rest as the same. I tried some other variations of what to display from the guide noted above just to see what things would look like as well, i.e. change \u@\h\ to \u@\W\ displays user@root working directory.
Hope this helps someone in the future. Cheers!
The green and blue don't match my black and red theme 
