Follow instruction on the cake box to make the cake. Let cake completely cool down after baking. You can set it in the refrigerator to cool it down for 10-15 minutes.
In a medium size bowl, add the powdered sugar and set aside.
Break apart the freeze dried strawberries, so they're in small pieces. They will crumble easily. Set aside.
Crumble the cake with your hands into a large bowl. Make sure not to leave any chunks. If some of the cake on the bottom and sides, are not soft then don't use this in the crumbs.
Add the freeze dried strawberries into the bowl with the cake crumbs.
Add 1 tablespoon of the frosting at a time to the crumbled cake. Using a fork, stir until well mixed. Take a spoonful in your hand and test the consistency by squeezing it in your hand. If it crumbles apart, add a little more frosting. You will want it to hold together without it being sticky.
Then add the next tablespoon, and repeat mixing. Do not add too much frosting, because the mix should stick together into a ball but not be wet and soft from too much frosting.
When you have just the right consistency, it time to roll into the balls. Get about 2 tablespoons of the mix in your hands, and form it into a ball. Then roll in a circle between your hands to get an even and round cake ball.
Once you have formed all the cake balls. Place about 5 at a time into the powdered sugar covering them until they'er all white. You can use a spoon for this, or simply move the bowl in circles so the cake ball roll around and are covered with the powdered sugar. Remove them from the powdered sugar, and set on a plate. Repeat this until you're done.
Sprinkle them with the pearl dust. You may wan to re-plate them if you're making these for a party.