Then you have flashed wrong zips
Need more info, not working doesn't help us help you.
Ok I'll try to write everything I have done.:
My device OPO with LAOS14.1 latest build.
TWRP 3.1.0-K1
I've completly uninstalled Pixel launcher, Playstore, G+, YouTube, GDrive, Google app
I have flashed Black Pixel launcher, it went black.
Then I've flashed Playstore, G+, YouTube, Google app via Aroma, then flashed GDrive regulary. (All black versions)
After reboot only YouTube was themed and GDrive.
Then uninstalled not themed apps and tried Playstore to flash without Aroma, after reboot it was not themed.
If the Pixel launcher is uninstalled all above apps flash with black theme succesfully
Hope now it more informational