SuperChronos may be the most customizable Cydget theme to hit the market. It is now also fully LockHTML3 compatible.

In iFile, browse to System/Library/ LockCydgets/SuperChronos.cydget/
Then open SETUP.js and follow the instructions.

It allows you to configure the following:

Choose between 9 different theme colors (blue, cyan, green, orange, purple, red, yellow, white, black)

Choose between 11 different clock positions

Choose between 3 different clock sizes

Choose whether or not it glows, and by how much

Choose between 12-hr and 24-hr format

Choose between mm/dd/yy and dd/mm/yy

Choose whether or not it shows the temperature

Choose between Celsius and Fahrenheit, and Wind Chill

Choose between 7 different reactions to Notifications

Choose between 7 different reactions to Media Controls being activated

Choose between 7 different reactions to Notifications while Media Controls are activated

Choose between 7 different languages