This is how I got the theme changer working without installing Launcher Pro.
Get the application "Any Shortcut" from play store
Open the application and enter the following details
Application : com.lge.launcher2
Activity : com.lge.launcher2.theme.LGThemeChooserActivity
Action: [Keep blank]
Intent : [Keep blank]
Then : create, your shortcut is done !
Now open the shortcut and your theme chooser application will fire up.
Download LG themes from LG Smart World application (not installed by default) and start applying themes.
To install Smart World, open the following link from phone and download the apk and install -
http://us.lgworld.com/mobile/common...one.jsp?modelCd=VS986-US&assiFlag=N&tabFlag=N
Cheers! :good: