Here's a safe storage chart for frostings and fillings:
http://tinyurl.com/ymqp6x
(From Sarah Phillips of baking911.com.)
Here's a cream cheese icing that doesn't require refrigeration:
http://tinyurl.com/2ydx9b
(From Sarah Phillips of baking911.com - recipe testing for safe storage.)
Or you just add cream cheese flavored extract to your favorite buttercream.
Here's a source for larger quantity but inexpensive extracts (and more):
www.nationalflavors.com
http://forum.cakecentral.com/cake-decorating-ftopict-182341-.html
http://forum.cakecentral.com/cake-decorating-ftopict-263273-.html
http://forum.cakecentral.com/cake-decorating-ftopict-238741-.html
HTH
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