Changing icon themes ATT OG

[BCShakarov]

So I played with the OG at the ATT store and went with this phone because it was VERY snappy and I liked how it felt. I also like the customization options but I read here that the Optimus UI has a few themes preloaded like Biz, Cozywall and Marshmellow. I found these in the ALL section when I checked out the device storage and saw that they were listed under HOME THEME. I know how to change the icon by long holding and pressing the purple corner brush but the included icons are shoddy and extremely limited ,Can anyone help me find a way to access these other themes so that I can customize my icons without using a launcher.

THanks

 

[Giblet]

I believe the LG video demoing the phone said you could use images from the gallery.