I don't use live wallpapers traditionally. I find that too often there's a trade off in device performance and or battery life to make it worthwhile. I've made an exception to try this one out, and I'm pretty happy with it. Ubuntu Live Wallpaper tries to capture some of the feel of that great looking lockscreen on Ubuntu for Phones, in a live wallpaper for your Android device. And, while it isn't an exact replica, it's pretty close, and looks great. Currently still in beta, the developers describe it as their "hobby." But for a beta product, it's very well done.
One of my biggest annoyances with live wallpapers as I mentioned is performance and battery life issues. Even on high end devices, too often things become jerky and the battery life has just been sucked dry. So far, on the Nexus 4 at least, this hasn't been the case with Ubuntu Live Wallpaper. Battery life doesn't seem to be any less than usual, and scrolling through the homescreens -- in my case with Action Launcher -- is as smooth and speedy as ever.
There's a couple of features baked in too worth mentioning, and some due to arrive in future updates. A double tap anywhere on the wallpaper brings up the option to display either time, or remaining battery percentage. Coming in the future will be the ability to switch between 12 and 24 hour clocks, repositioning the circle, scaling and color change.
Remember though that this is still a beta product, and the developers are all to aware of performance issues affecting some devices. But, it's free, and worth a look if you're looking for a little flavor of Ubuntu for Phones without getting too deep. You'll find it in the Play Store at the link above, and click on past the break for some screenshots.