This tip is only for experts who understand the risks of editing system config files. (Obviously, this is not approved by Apple.) By the way, make sure you preserve the permissions on this file.
Edit the following file:
Add an entry like this:
Restart you Mac and you'll get a plain white menu bar. This hack forces the window server to act as if it were running on older hardware that didn't support fragment processing. I hope Apple gives us a configurable option (at least a dwrite) in the future so that people can rely on it. It's a shame that law-abiding citizens like myself can be driven to commit crimes against system integrity over minor look-and-feel issues but that's what happens when people get desperate.