Simple Floating Clock is a nice and easy-to-use clock for your desktop. The clock can be placed anywhere and it can be moved as you please. It can be digital or analog, and you can even show the date, am/pm indicator, seconds, day of week, and time zone, among other things. The clock can be placed behind all windows and made invisible to clicks. If you select the latter, the invisibility can be disabled by clicking on the corresponding icon on the menu bar.
Unfortunately, the clock only has one layout, but it comes with four different styles: no numbers, Roman numbers, Arabic numbers and dots. If you want, you can even use an image for the style. You can even adjust its size and add a border. What is great is that you can add as many clocks as you want and select different time zones and configurations for each one of them.
In short, if you are looking for a simple but useful clock for your desktop, Simple Floating Clock may be a good choice, especially if you need to have multiple time zones at hand.