If you surf the xda-developers forums, you will notice there are so many themes on Touch Flo clocks, icons and sliders. Customising them requires you to extract those manila files manually.
Grumps decided to write this application to perform the customising for you. All you need is to extract those files into the following folders.
The Clocks are stored in ….\ManilaCustomiser\Clocks
The Icons are stored in ….\ManilaCustomiser\Icons
The Sliders are stores in ….\ManilaCustomiser\Sliders
The TopCurtains are stores in ….\ManilaCustomiser\TopCurtains
The BottomCurtains are stores in ….\ManilaCustomiser\BottomCurtains
Source: http://forum.xda-developers.com/showthread.php?t=437420