Back when Clock Hub worked. Now using Analog Clock Tile until someone comes out with a reliable digital tile. I use Car Dash as a kind of glance screen to keep the phone from sleeping/locking while charging. "Cellular Data" switch by Microsoft. White Screen of Life flashlight, which is now pretty usable on the L520 since you can add brightness to Action Center.
I like a lot of these but I think the kinds of backgrounds that work best with these transparencies are the backgrounds that have some depth and elevation to them. Like the one Tab Numlock posted. I have one like it on my phone image as well. Those that appear to show you are looking from a height and look good are hard to find. I am on the hunt for backgrounds like that. If you know where they are, link up. Thanks.