SSPE v11.5 shaders for Minecraft PE 1.2 version on iOS and Android! (read more)
Watch the video above to see what the shaders looks like!
The SSPE shaders for MCPE 1.2 on iOS and Android won't change your game too much, but enough to make it look better. It adds custom clouds (sky), waving grass and leaves along with shadows, of course. I'm not sure how much of an impact it has to your game performance, on my OnePlus 3 phone I can run MCPE smoothly with and without the shaders enabled, I don't see any change on my performance.
You can find the download link in the video description!