Rainmeter Skins / White Ice (Lite)
Or, try these alternate versions:
White Ice (Lite) is simply a black-and-white color schemed skin with a clock, time and date, and weather display. It autoscales to your desktop and is made to suit sitting above the taskbar or floating in the upper or lower portions of the screen. A fuller version of White Ice will be released in the future, with several other features and versions. I hope you enjoy it.
Licensing: the artist has specified that mods are allowed.