In Excel 2007, need to differentiate rows by color.

In column M,
"H" = Color 1
"A" = Color 2
"P" = Color 3
"L" = Color 4

I will be printing data from the spreadsheet, so I'd like to use lighter
shades of colors rather than the bright, primary colors that will show up
dark on printed pages.

Thanking you in advance.

Betty