change default background

rootfs/etc/dconf/db/local.d/01-background

@@ -2,8 +2,8 @@
 [org/gnome/desktop/background]
 
 # dconf key names and their corresponding values
-picture-uri='file:///usr/share/backgrounds/chimeraos/chimeraos_background.png'
-picture-uri-dark='file:///usr/share/backgrounds/chimeraos/chimeraos_background.png'
+picture-uri='file:///usr/share/backgrounds/sk-chos/kay-l.png'
+picture-uri-dark='file:///usr/share/backgrounds/sk-chos/kay-d.png'
 picture-options='scaled'
-primary-color='000000'
+primary-color='3071AE'
 secondary-color='000000'

rootfs/usr/share/gnome-background-properties/kay.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
+<wallpapers>
+  <wallpaper deleted="false">
+    <name>Kay Background</name>
+    <filename>/usr/share/backgrounds/sk-chos/kay-l.png</filename>
+    <filename-dark>/usr/share/backgrounds/sk-chos/kay-d.png</filename-dark>
+    <options>zoom</options>
+    <shade_type>solid</shade_type>
+    <pcolor>#3071AE</pcolor>
+    <scolor>#000000</scolor>
+  </wallpaper>
+</wallpapers>