regarding to your post on how to change the theme on you LG cookie, just open your setting menu then click screen setting option followed by opening the "wallpaper setting". you can use the default theme or change it to your preferred images stored on your phone by choosing "use existing image"....
hoping i was able to help......... though late..........
if ever you want to change the setting of your ringtone, all you have to do is go to your setting then open the profile option. you can add a new profile or use the default. that option can be edited or change to your preferred setting.
i hope this info can help you out. if not just PM me so i can help you further.