Combine everything in a blender or food processor and puree until smooth. To get the different colors like I did, simply play around with the ratio of berries. More acai powder will make darker smoothie bombs, while more goji powder will make lighter smoothie bombs.
Pour the mixture in an ice cube tray and place it in the freezer for several hours or overnight.
Once frozen, transfer to a an airtight container and store in the freezer indefinitely. Add 3 or 4 bombs to your next smoothie and blend as usual.