Bug 1016713 was fixed so many of the off-color issues have been resolved, but there is still a color mis-match in the Language Support (and possibly other) dialogs when you click on a button to submit.
Screenshot attached, in this screenshot I am clicking on the "Apply System-Wide" button so you can see the behavior.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: shimmer-themes 1.5.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-9.9-generic 3.5.0
Uname: Linux 3.5.0-9-generic x86_64
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
Date: Sat Aug 11 11:55:50 2012
InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120811)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: shimmer-themes
UpgradeStatus: No upgrade log present (probably fresh install)
Yeah, I can confirm that, pressed buttons show a different grey color.