Creating Styles

How can I create a new grid style, new header images??

there is an IMAGES.CSS file that defines the images used in the system. You can create new images (PNG, GIF, JPG, BMP) and add them to this CSS file in the same way that the current ones are listed. Something like this:

.aw-image-home		{background: url(icons.png)  -40px 0px;}
.aw-image-favorites	{background: url(icons.png)  -80px 0px;}
.aw-image-search	{background: url(icons.png) -120px 0px;}
.aw-image-fontsize	{background: url(icons.png) -160px 0px;}
.aw-image-redBall {background : url(redball.gif) 0px 0px;}
.aw-image-car  {background : url(policeCar.jpg) 0px 0px;}

i want to create a new id