Whipping cream and fondant do not get along. For some reason whipping cream tends to "melt" the fondant. It isn't a pretty sight. You can stabilize whipped cream so that it lasts longer without deflating but it would still need to be refridgerated. You can color and pipe simple designs with whipped cream as well. If you want to use fondant you could use buttercream or ganache underneath or some people just heat a seedless jam (usually apricot) and glaze the cake with it before putting fondant on it. (The cake itself must be very smooth for the glazed option as the fondant will show flaws wherever the cake has flaws.)
Triplicate post, please also see:
http://www.cakecentral.com/cake-decorating-ftopict-643491-.html
http://www.cakecentral.com/cake-decorating-ftopict-643495-.html
HTH
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