I only have access to Wilton colors so which colors would be good to mix to make Navy blue and Maroon?

Wilton icing color chart suggests burgundy + red red = maroon
and
royal blue and black mixed gets you navy

http://www.wilton.com/decorating/icing/icing-color-chart.cfm

here's another chart

http://www.sliceofromance.com/colorchart.html

I typed maroon icing? into the yahoo search field. there's another link that I won't even bother trying to shared 'cause it won't show up anyway....at that site, there's several other charts that use chefmaster and americolor colors.

s u g a r c r a f t d o t c o m is the site...

lol
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In addition to the Wilton link all4cake's posted.

Tips on coloring:
http://www.wilton.com/decorating/icing/tips-on-coloring-icing.cfm

Thanks so much! This is great!