Search For the Perfect Frosting

So, I've run into a bit of a problem here. I made cupcakes, but how do I go about frosting them? The issue at hand is this:

Not only does the frosting have to be Vegan (for the dietary needs of other people eating the cupcakes) but it has to be corn-free (for me). And all powdered sugar has corn starch in it. A LOT of corn starch. And much of the "good" vegan shortening or butter has corn in it (in some form on the ingredient label). So I'm in search of a corn-free vegan frosting solution.

I am going to have to think long and hard about this one. If anyone has any suggestions, I'd really appreciate it.