Today Google add 3 new categories exclusive for Pixel phones and the new Rainy Day from Pixel 2.
A lot of roms have the wallpapers active beacause is include in the official Gapps. But some do not have it because a small file is needed. This file is called "nexus.xml"
This little file not only activates these wallpapers, but also activates the unlimited space in Google Photos and more applications in Google Play.
how to activate? Its Simple
1-Need the Official Google Wallpapers from Google Play
2- You need root
3-Download the "nexus.xml" file from here LINK
4-Copy this file to /system/etc/sysconfig
5-Change the permissions to rw-r--r--
6- Restart the phone and READY!
P.D: if you need to disable the option of unlimited space in google photos. You need to delete this lines in the "nexus.xml"
<feature name="com.google.android.apps.photos.NEXUS_PRELOAD " />
<feature name="com.google.android.apps.photos.nexus_preload " />
If the wallpapers do not appear, try to change with the application "Build Prop Editor" the following lines.
1>>'ro.product.model=Redmi note 3' to 'ro.product.model=Pixel 2 XL'
2>>"ro.product.brand=Xiaomi ' to 'ro.product.brand=Google"
3>>"ro.product.manufacturer=Xiaomi" to "ro.product.manufacturer=Google"
4>> then add 'ro.opa.eligible_device=true' at the end
Install the new Pixel Wallpapers 2017 with the new beach live and more!
Thank you @pranavpandey for the mod! Working 6.0+