Attached is an example of how you highlight every other row of data on a report...

Here are some other useful links as well:

1) Highlight Alternate Rows in a Report (http://office.microsoft.com/en-us/access/HA012191461033.aspx)

2) Highlight Alternate Rows in a Form (http://www.access-programmers.co.uk/forums/showthread.php?t=76916&highlight=alternate+rows)

3) Another possible thread for research (http://www.access-programmers.co.uk/forums/showthread.php?t=45578&highlight=alternate+rows)