Check Out the Video Below!
It is a clean app that allows you to apply themes (hopefully more in the future) and gives you the option if you would like to only apply a select few like the boot animation, lockscreen wallpaper, homescreen wallpaper, system UI, sounds, etc. Some themes support all these options, while others only support a few.
Overall this app is very easy to use and even easier to apply certain parts of the themes. Unfortunately majority of the current available themes are paid, but there a couple that are free that help get the job done.
