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sub menu's are indented tho, which makes them stand out..
but as they are links, they're defined under a: classes in the css, and any change will affect all links..
the only other alternative i can think of is to edit the template of that block and find the code for the sublinks part, and add an inline style="" command and define the color there..
edit*
look for
td#mainmenu a.menuSub {padding-left: 10px; border-right: 1px solid #666666; border-bottom: 1px solid #666666; border-left: 1px solid Silver;font-size:11px;}
in your css and change it.. i don't actually remember if adding: color: ; will work or not in this case