Have you installed Desktop clock widget? After the installation open the clock settings and de-select the box with the option "Use default theme" . Then tap on "Custom theme" (or comething like this xD) and browse until the clock-theme folder (you have to unzip the archive first..) At last, after opening even the theme folder, the system will say you that there are no other subdirectories... and right now you have to select the folder in which you currently are using the box at the top. I hope to hoave been able to clarify all doubts ... also because at the beginning even I did't understand how to set the themes xD