Use PlasmaPkg for themes, this provides a nice easy mechanism to install themes, as well as checking validity.
Git commit ceb32ef93bbab867755824c702ba0679f934605a by David Edmundson. Committed on 30/12/2012 at 21:54. Pushed by davidedmundson into branch 'master'. Merge branch 'package' REVIEW: 107900 http://commits.kde.org/lightdm/ceb32ef93bbab867755824c702ba0679f934605a