One of the biggest changes in Android 5.0 Lollipop is the new Material Design user interface, which makes everything looks cleaner including the wallpaper. The Android 5.0 Lollipop update is yet to be available, but you can enjoy some Lollipop features right on your device. For example wallpapers and sounds.
It is expected that Android 5.0 Lollipop will be released on Nov 3, 2014 and without doubt, the Nexus 5, Nexus 7 and Google Play Edition handsets will be the first devices to get the update. Many smartphone manufactures have already announced the Lollipop update for their devices, which includes Motorola, HTC and Sony.
Now comes to the wallpapers and sounds. There are two sets of wallpapers.
The first one is by a Google Plus user that includes two official Android 5.0 Lollipop wallpapers – one is an abstract picture and other is an image photographed by NASA satellites. [Download from here]
The second is from the new Android L Developer Preview images on the Nexus 5 that includes 10 high-resolution wallpapers. [Download here] [Courtesy to Droidlife]