James Spencer of Basic Brewing radio just did an interview with the guy, a SA employee who won the employee contest, who came up with the Bosyenberry Wheat recipe. I'll summarize as best I can.
Wheat Extract
Boysenberry extract
Hefe yeast
Hops I can't remember specificly, but it was one or two small additions of (I *think*) Hallertau.
It really wasn't much of a recipe

. No specialty grains, if I'm remembering right. I'm pretty sure he used a wheat LME.
Honestly, I think the biggest variable is going to be getting the boysenberry extract right, both in terms of finding a high-quality extract and using the right amount. Don't use a lot of hops, you *might* add a little cystal 10 for some sweetness, but it's really a very, very straightforward recipe.