I recently discovered a very nice clock program. The program is called ClocX and can be obtained at http://clocx.php5.cz/
. It is highly configurable in terms of settings, shape, size, and background images. It has several nice options, including my personal favorite "click through", which allows it to be set to stay on top of other windows but lets you interact with the window beneath it as if the clock was not there. This is the nicest donationware clock program I have ever found and is better than many shareware clock programs.
If you need alarms, however, you'll need to look elsewhere.