Hi Yasser,
Find folder /templates/hot_snowflake/styles and you'll see 5 files inside, style1.php, style2.php, etc.
Open, in example, style1.php in plain text editor. You will find all template parameters in each file, like this:
$backgroundImage="bg2";
$backgroundColor="#999";
$topMenuBg="#7e8182";
...
In this example, background is set to bg2, background color is #999, top menu background is #7e8182, and so on...
So, use Custom style while testing and making your own style, then just copy all data in file style1.php. Then, test and make another style and copy data to style2.php, and so on.
This explanation is valid for all our templates with custom styles support.