White wallpaper hides other accounts

I have a wallpaper which is, on the left-hand side, completely white. When my account is selected at the login screen, I cannot see that there are any other accounts available, as the only graphics indicating those other accounts (i.e. the username) are in white. Perhaps the addition of another colour, a drop shadow or an overlay over the wallpaper in another colour would be a solution for this, or perhaps (though probably not that smart performance-wise) detecting the main wallpaper colour and adapting to it.

The wallpaper in question: http://i.imgur.com/rTUlv.png

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-greeter 0.2.8-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic-pae 3.2.30
Uname: Linux 3.2.0-32-generic-pae i686
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
CheckboxSubmission: ffa272594b3050261c2489e0138ba7e0
CheckboxSystem: d9106e4050cf94506a6b179a197a27e7
Date: Thu Oct 18 13:08:15 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
SourcePackage: unity-greeter
UpgradeStatus: No upgrade log present (probably fresh install)