Here are some apk extracted from the new Nexus 5 ..
Please install the apk only if higher than 4.1.2 is the operating system of you.
Launcher 5: For this purpose three apps to be installed. Play the Google Services, Google Search and Google Home.
After that, you automatically have the new backgrounds on the system.
Here I have all the apk are listed below, packed together with wallpaper in a zip. So Unzip and place the apk on your internal SD card. Activate in Settings / Security / Unknown Sources and then click on the apk and follow .... so really easy ...
Google Play Services (v4.0.30)
Google Keyboard (v2.0.19003.893803a)
Google Search (126.96.36.1996092)
Google Home (0.9.6.886092)
here is the Link....
Look here for screenshots..https://plus.google.com/u/0/communit...18952474682512
Have Fun and the Launcher 5 is nice...all apk run greate and no Problems and many new Feature...