My husband (my IT guy) and I both have Microsoft Office 2007 installed on our computers, and we enjoy using the expanded palette of colors. However, this can be a problem when we work with people who are using earlier versions of Office. Being a resourceful person, he created a color matrix tool for use with Excel which guarantees we use/see the same colors as those with the 2003 version. Check out this cool tool at http://avapss.net/colormatrix.aspx.
Match colors from Excel 2003 to Excel 2007