After @Andres_Cotes permission I am sharing this video to show how I have used the extension to change the "theme" of my app.
I changed Sidebar, Actionbar, FABs, labels, textboxes, listpickers color.
I simply included a button in my Settings "screen" to change the colors to the components I wanted.
I have used 2 buttons to change the primary and secondary color I wanted.
The reason that I am describing all these is because the app is in Greek so you will probably understand nothing of the text in the labels, unless you speak my language.
Here is the video