Background and Fill Effects in Excel Charts.

Horizontally Banded Chart Background
Chart with Colored Quadrant Background
Colored Vertical Band
XY Scatter Area Charts - Fill Below XY Series
XY Scatter Area Charts - Fill Between XY Series
Line and Fill Effects in Excel Charts Using VBA
Line and Fill Effects in Excel Radar Charts Using VBA
Apply Fill Color Between Lines in a Chart (TechTrax Article)
Matrix Chart (TechTrax Article)