Never tried it before. Sorry. It says Windows 8 experimental so that should work but since I use original themes I cannot guarantee this works.
It seems like it is outdated, look at the update date.

What theme? You can edit theme files (*.theme), original ones using AeroLite and High Contrast or 3rd party themes which require patching of system files... but default aero themes don't apply color changes.

See here more themes that use changed font colors:
Special Themes (AeroLite and High Contrast variations)
Never mind, I read it wrong.