Since version 1.5.1.0 Line, Column and XY charts can have striped plot area, like in these examples:
http://www.amcharts.com/xy/time-plot/
http://www.amcharts.com/line/chart-with-reversed-y-axis/
As you see, every second area between grid lines is filled with color.
Two settings were added to achieve this:
<grid>
<y_left>
<fill_color></fill_color>
<fill_alpha></fill_alpha>
Instead of <y_left> there can be <y_right> or <value> (for column chart), <x> or <y> for XY chart.