OK. How about this:
Taifun, I just tried your "Modified 'A better Color Picker'" project. Although still the problem (being the Status Bar does not change colors) occurs. This might just be an issue with my phone, if it is please let me know. My phone info:
Android Version: 5.1
API Version: 21
Hardware Version: wuzA
I hope some of this will help somebody to find a way to fix this. Thank you.
If this is still not helpful, then I obviously can not help anyone.