Every single SMS theme has it own particularities, and the "Fossil Clock" one is special due to its huge slate grey combinations and cool features, so give it a try quickly!
*** How to Apply this Fossil Clock SMS Skin ***
1. Open Fossil Clock SMS Skin
2. Click on the "Apply Fossil Clock theme" button
You will need to download the main SMS application before using this theme but don't worry, it's free!