Adding themes to Roller 4.01 and Roller 5.0-dev
As the title indicates, themes made for Roller 4 work fine in Roller 5 (currently) and the method of applying them is the same for both versions.
To get started, there are individual themes or a bundled all in one archive of all themes at RollerWeblogger on java.net so download whichever ones you want.
Then extract them into your $CATALINA_HOME/webapps/roller/themes directory. (where $CATALINA_HOME is the root directory of your Tomcat installation)
Redeploy roller or restart tomcat and all the themes should now be available for selection in the admin/themes area of your blog. Note that ‘allow custom themes’ should be enabled in the global admin area for individual blogs to be able to choose a new theme.