I have switch to using the Wilton Snow White Buttercream exclusively. People LOVE it. It is not as sweet as regular Buttercream. The key is to use Popcorn Salt instead of regular salt. Here's a link to the website: http://www.wilton.com/recipes/recipesandprojects/icing/snow.cfm
For the Snow White Buttercream, I have decorated cakes with it as well...made roses, borders, etc., it's all in the consistency (how much water you add - the stiffer is better for roses, thinner is better for frosting the cake, etc. As you normally would for regular Buttercream, follow the same rules).
As far as Popcorn Salt, you can probably find it at your Grocery store. You'll need the one labeled 'buttery'. The one I buy is made by Reese. My local store stopped carrying it, so I had to order it online. Here's the website: http://www.c-els.com/sfCatalog.asp?sn=E080420030200057&pchid=63851 I got this tip from another website and this is one product I can not live without in the world of Cake Decorating
http://cakecentral.com/modules.php?name=Forums&file=viewtopic&t=19948&postdays=0&postorder=asc&&start=0
This is (hopefully) the link to the post discussing it. GL.
Italian Meringue Buttercream
Makes 4 1/2 cups
Use this to frost the Baby Block Cake, or your favorite layer cake.
1 1/4 cups sugar
5 large egg whites
Pinch of cream of tartar
1 pound (4 sticks) unsalted butter, chilled
1 teaspoon pure vanilla extract
1. In a small saucepan over medium heat, bring sugar and 2/3 cup water to a boil. Continue boiling until syrup reaches 238° on a candy thermometer (soft-ball stage).
2. Meanwhile, place egg whites in the bowl of a standing mixer fitted with the whisk attachment, and beat on low speed until foamy. Add cream of tartar, and beat on medium-high speed until stiff but not dry; do not overbeat.
3. With mixer running, add syrup to whites in a stream, beating on high speed until no longer steaming, about 3 minutes. Add butter bit by bit, beating until spreadable, 3 to 5 minutes; beat in vanilla. If icing curdles, keep beating until smooth.
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