Set the color and background image of the column titles with the colorTitle property.
The image is set to background=/php/phplens/img/granblue.gif (picture on right). Internally, the code generates the following: <TD bgcolor=white background=/php/phplens/img/granblue.gif>
Set the color and background image of the data cells with the colorLens property.
The image is set to /php/phplens/img/swirl.gif (picture on right). You can also have different images for each column.