Try this site
for ringtones. You'll have to upload them to your own server, but you can just use geocities.
All you really need is either a midi file or MMF file (not sure for LG phone) and a wap site (see attachment).
Just edit the file using notepad, then upload it and your ringtone/background to the web. And Voila, a free ringtone/background!
You can make your own backgrounds as well you know. You just have to create a picture that is 120 x 96 pixels. (obviously you would want to create a pic that is at least 240 x 192 pixels so you can edit it, then resize it later).
Here's an example of a simple background that I made for my phone (Nokia 3530).
I've done some for my friend as well, it's very simple.
EDIT: Damn, I can't upload the .wml file, you can just get it here