Rainbow set (100 kb) - download executable and run.  Then go to Options > Settings screen and select Theme > Buttons > User Installed
Requires version 1.6.4 or later
Custom 1 set (100 kb) - download executable and run.  Then go to Options > Settings screen and select Theme > Buttons > User Installed
Chrome set 1 (100 kb) - download executable and run.  Then go to Options > Settings screen and select Theme > Buttons > User Installed
Custom 2 Set (100 kb) - download executable and run.  Then go to Options > Settings screen and select Theme > Buttons > User Installed