Have you tried using shortening instead of a butter substitute?
All vegetable non-hydrogenated Spectrum:
(Palm oil.)
http://www.amazon.com/dp/B001FA1DG4/?tag=cakecentral-20
HTH
I have used that before in cookies and works great. Not sure where you are located, but Earth Fare carries it and I think so does Whole Foods.
1/2 cup soy margarine, softened
1/4 cup soy milk, rice milk, or other non-dairy milk of choice
3 cups Veganized Powdered Sugar
1 1/2 t. vanilla
Using an electric mixer or in a large bowl with a hand held mixer, place the soy margarine and soy milk, and cream them together. Add half of the sugar, and beat well to combine. Add the remaining ingredients and continue to beat the mixture until light and fluffy.
*Note: For a Berry Frosting, add 1/4 cups mashed fresh or frozen berries, such as raspberries, strawberries, or blueberries.
For a Chocolate Frosting, add 1/2 cups cocoa powder or 1/3 cups melted vegan chocolate chips.
For a Coffee Frosting, substitute cold coffee or espresso for the soy milk in the recipe.
For a Mocha Frosting, substitute cold coffee or espresso for the soy milk in the recipe and add 1/4-1/3 cup cocoa powder or 3-4 T. melted vegan chocolate chips.
You can also stir in chopped nuts, chopped vegan chocolate, shredded coconut, or chopped fruit into the basic Vanilla "Buttercream" Frosting recipe to create additional variations.
This is from the Vegan chef website.
HTH & GL
jess
I'm not at home this weekend, so I don't have access to my cookbooks........but I'm sure I've read in a vegan cookbook a recipe for buttercream that used coconut oil (it's actually solid at room temp.)
A quick google search turned up this, but maybe you can find more like it:
http://www.vegnews.com/web/articles/page.do?pageId=2259&catId=11
you could use any all vegtable shortening and for the liquid water. You could also mix non- dairy creamer with hot water for the liquid. Vanilla and butter extract for the flavors.
Umm, it's not as simple as that. Most (all?) vegetable shortenings have soy in them (OP stated she can't use that.) Non-dairy creamers are a misnomer--they have milk derivatives.
Here's a question (I am not vegan or vegetarian)....
Why the no soy? I thought vegan meant no eggs or dairy b/c they are derived from animals but soy is a plant.
Just curious...
Soy is completely vegan, but many people have soy allergies. Don't know if that's the situation with the OP.
Here's a question (I am not vegan or vegetarian)....
Why the no soy? I thought vegan meant no eggs or dairy b/c they are derived from animals but soy is a plant.
Just curious...
It's because of allergies. My daughter can't have eggs, dairy, or soy. It was just easier/clearer to put "vegan" in the title rather than "dairy-, soy-, and egg-free". 
Here's a question (I am not vegan or vegetarian)....
Why the no soy? I thought vegan meant no eggs or dairy b/c they are derived from animals but soy is a plant.
Just curious...
It's because of allergies. My daughter can't have eggs, dairy, or soy. It was just easier/clearer to put "vegan" in the title rather than "dairy-, soy-, and egg-free".
I sooooooo get that. We have complicated and multiple allergies and food sensitivities in our family. Going out to eat with all of us is a hoot!!!!!!
Gotcha. That's rough and doesn't leave you many options. Hope you can get that soy free shortening.
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