1. Download the 2 files attached to this post
(GmailNew3Inverted.resflux.zip <--changes the colors, and
com.google.android.gm.apk <-- changes the images)
2.
Install resflux from here this changes text and some other swipe colors.
3.
Install holothemer.apk from here this directs most of the backgrounds to the holo dark background.
4. Enable them in xposed installer app
DO NOT REBOOT YET.
5. Push the gmail app to system/priv-app ( note: if its not there already, then uninstall the previous version )
6.
Reboot your phone now.
7. Open holothemer and scroll to gmail and change it to holo-dark (also do the same for google+ if you want, to lose the red and white)
8. Open resflux and press the home button (so it creates its folder on your phone)
9. Push the resflux zip from the attachment, to the resflux folder on your INTERNAL memory.
10. Open resflux and tap on LABORATORY.
11. Scroll down and tap on gmail..... let it maps its resources.... may take about 10 minutes or longer to do so.... let it do it, it only does this once.
12. Once the resources are mapped.... back out to the main resflux screen and tap IMPORT.
13. Import the gmail zip and reboot the phone.
14. Enjoy.