Jana Sattainathan shows how easy it is to change the colors for Powershell warnings and errors:
How could such a nice tool have such a terrible choice of colors for errors and warnings? I am talking about the ISE and the unreadable contrast of colors.
You can fix it. Open and update your profile by running this from your ISE (which opens your profile in NotePad)
It’s Powershell, so you can do it in a couple lines.