I’ve heard several people complain about the fact that the chart pattern fills are not available in Excel 2007. This feature can be useful if you print charts on a non-color printer. Although charts created with previous versions of Excel continue to display the pattern fills, there is no way to apply patterns fills using the Excel 2007 UI.
Microsoft’s Eric Patterson addressed this problem by creating an add-in. You can download it here: Chart Pattern Fills.
This add-in creates a new group (Patterns) on the Chart Tools / Format tab. The group has one control that, when clicked, shows the available patterns to apply to the selected chart element.