Ok I'll try to write everything I have done.:
My device OPO with LAOS14.1 latest build.
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
Best thing to do right now is restore your backup. "Hope you made one" then start over uninstalling updates then flash single zips not aroma.
Look at Help and guide in updater for more info on flashing zips and apk installs.
Hope that helps!