are you using real butter? because that would do it.
It could be butter or your vanilla extract if it is not the clear kind.
You can also whiten it back up using this:
http://www.wilton.com/store/site/product.cfm?id=3E30B53A-475A-BAC0-5FBDEF5E8A8FCFF2&fid=0EC60A47-475A-BAC0-54338024A0B6A5A5
It's probably butter if you are using it. You can also whiten it by adding the tiniest (I mean TINY) bit of violet color to your icing to counteract the yellow. I learned that here and it really worked! I ALMOST put too much in, but I think it looked pretty white. (see my spartan cake in my photos) I use butter in my icing and it usually is a little off white. Not a big deal to me, but I wanted really white icing for my spartan cake so I tried it. Or you could just use the all crisco icing.
wow, merrissa, just looked at your cakes, gorgeous! love the rose ones!
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