LG G Flex is a unique smartphone in itself because, to some extent, it realizes the possibility of a flexible phone with its curved display. While this device looks awesome and features pretty good specs, like other LG devices, its home launcher and keyboard also supports themes. The theme feature of LG devices is really a cool thing because most devices from other OEMs do not have this capability. To get a theme working on other devices, you will have to root them and install a custom ROM, mod or a third-party home launcher. But if you have an Android device from LG, you can theme it very easily. If you already own the phone and are looking for themes for LG G Flex home launcher and keyboard, we have come with a nice collection of beautiful themes for you. By applying different themes on your LG G Flex, you can add variety to your mobile experience and enjoy refreshed look in the user interface. Besides LG G Flex themes for the home launcher, we also have some beautiful themes for the stock keyboard. Today, we are sharing 12 themes for the home launcher and 3 themes for the keyboard but we'll keep looking for more themes that work on LG G Flex and add them here. Here is some previews of the themes that we have provided below. 
Download the theme files from above, copy them to your LG G Flex and install as you would install any APK file. LG home launcher themes can be applied from launcher settings. To change keyboard themes, go to device Settings> Language and input and choose your keyboard theme. source
Download Themes for LG G Flex
Download ThemesLG G Flex Keyboard Themes
Download the theme files from above, copy them to your LG G Flex and install as you would install any APK file. LG home launcher themes can be applied from launcher settings. To change keyboard themes, go to device Settings> Language and input and choose your keyboard theme. source
I have lg g flex 2
I want to change my keyboard ti lg flex 1 keyboard
I like the sounds
How can i change it any help?
Will these themes work for LG G3 ?
No. Try these instead:
https://docs.google.com/file/d/0B7SCfB5zimVpSVNZYTIxTDI5MzA/preview
https://docs.google.com/file/d/0B7SCfB5zimVpNzM5a0VpcGZfLVk/preview
https://docs.google.com/file/d/0B7SCfB5zimVpSVNZYTIxTDI5MzA/preview
None of these works bro
I have been using them on mine. You need to push the APKs to system/app using Root Browser and fix file permission.
Reference: https://www.droidviews.com/how-to-setfix-file-permissions-on-android-devices-a-beginners-guide/
Do these themes work on kit kat?
Most of them.
it also work for lg g2
Yes, try them. We also have a separate post for the G2: https://www.droidviews.com/collection-of-beautiful-themes-for-lg-g2-home-launcher/
yes,I know