I went with gray mixed with a bit of dark purple. The fabric is still pretty light as I didn't want it to overwhelm the darkness of the pattern. And I thought the purple will pull out the purple of the pattern and the gray will pull out the black lace on her shoulder and in the bottom of her dress.
I was going for a storm cloudy look. Since Rapunzel still has long hair I wanted the background to reflect that. She hasn't been rescued yet and is stuck in her tower which is kind'be the storm before her happy ending. Made sense to me lol.
I thank you guys for all of your input it made the decision easier! I'm really fighting gridding my fabric now because I need to finish paradise!