Plant based Red, White and Blue Fourth of July Cake without eggs, oil or butter

Fourth of July Menu from early in our plant-based life:

We are going to have hummus and raw veggies, and BBQ Soy Curls in a spinach wrap with coleslaw, baked beans, pasta salad, spinach salad with dried cranberries and for dessert—red, white and blue cake (if you aren't allergic to watermelon that would be a superior healthy dessert option).

Alternate menu: Portabello mushroom "burger patties", Quinoa Salad, Corn on the Cob, Asparagus.

Cake made from a mix without eggs and oil.

Red, white and blue cake (a dessert for the holiday--not something you should eat a lot of)
Ingredients:
2 lbs fresh blueberries
1 lb fresh raspberries
1 package white cake mix, dry (this could be replaced with flour, baking powder, sugar and dried non-dairy milk—I will have to work on that—but in the meantime…http://www.food.com/recipe/homemade-yellow-cake-mix-subtitute-18-25oz-betty-crocker-box-472383)
1/2 cup applesauce
1 cup water
1/8 cup egg replacer powder
1/3 cup rice milk, or your favorite non-dairy milk
Steps:

1. Coat a 9"x13" pyrex baking dish lightly with crisco olive oil spray.
2. Pour all but 1/2 cup of the fresh blueberries into the bottom of the baking dish.
3. Combine all the other ingredients except for the raspberries, using a mixer set on medium speed.  Scrape sides of bowl halfway through mixing.
4. Pour batter over blueberries and bake at 350 degrees f until toothpick comes out clean, about 32 minutes.  
5. Let cool on wire rack.
6. Make a white frosting using 3 Tbsp. Tofutti sour cream, 1 Tbsp. rice milk, 1/4 teaspoon vanilla, 2 to 3 cups powdered sugar and a pinch of salt.  Adjust sugar and/or milk until you have a nice consistency.  (Goal: to look like traditional frosting but without all the fat of butter or shortening.)
7. Frost the cake, using a thin layer, just enough to act as "glue" to keep the berries from rolling around.  Place the raspberries in stripes and the blueberries in the corner—just like our beloved American Flag.
8. Take a bow as you serve it at the family 4th of July barbecue.