There is no documented way to get arbitrarily colored text in the command window. The only documented features with colored text are error (red), warning (orange), and by adding a hyperlink (blue):
Actually hyperlinks are more versatile than most users realize, and are sadly underutilized:
To get text in any arbitrary color you could download and use Yair Altman's excellent FEX submission cprintf, which relies on some undocumented functionality and features of MATLAB:
Thus you can simply create your own message using whatever color you want, and even define it in a function called note, message, or whatever. Note that cprintf is not supported by the MATLAB documentation and could break, so use it at your own risk.
Yair Altman's blog explaining the development of cprintf is definitely worth reading:
