We have a storm sky gradient that can be used instead of our normal eastern or western sky. This adds an additional $40 per scene regardless of size on BackGrounds and $10 for BackDrops. We also darken the clouds that are shown on the scene selected. The storm sky will match to other scenes with the same sky. All scales and print sizes apply. Be careful that the darker backdrop doesn't overpower your layout. We can also transition ($60) from Eastern or Western sky into Stormy sky.
There is risk when changing the sky as the scene is made with the original sky and a darker sky can expose artifacts and halos not visible with the normal sky. Artifacts cannot be corrected.