Oh that is really very pretty. I like it alot.

I think what you do for drapes should depend on how much contrast you want. You could use the drapes as an opportunity to bring in some of the green for contrast, it doesn't have to be an exact match. Or you can stick with the blue violets and just use a color that's a tad darker than your wall color. White curtains are always pretty too. I tend to lean towards a solid, BUT, maybe a simple and pale stripe that has a couple of the colors in it might be pretty too! The nice thing about that bedding is there are plenty of options.

I'm torn between using white curtains if I put color on the wall or leaving walls white and bringing in the violet on the curtains! Ugh!
I went to C&B today and the teal really stood out to me. Another direction to consider. They had a pillow they called 'Aqua' but that is misleading. It is less vibrant than the bright blue one above. More green/blue. Here it is:
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And here are throws for the bed:
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Each of the throws above have matching euro shams.
I'm about to pull my hair out!

I guess I would start by looking for drapery panels in colors that work and see what you can find. My hunch is it'll be much easier to find white than violet or green. That speaks to using the color on the walls if you want to contrast the panels with the paint.

See, I think the white curtains with the colored walls would be beautiful. I did that in our guest room. The colors are all my favorites which is why I think a stripe in white, teal and green would be pretty too.

I guess I am putting the cart before the horse somewhat. As Amy suggests maybe paint should be considered last. Figure out the windows and then once all the elements are together, decide on walls. Hmmm? They did have a pretty blue green linen cotton drape? Nothing in the lavender and the green ws the same citrusey green of the piillow above. Too much for me. Uh oh, I think I may be narrowing it down. Keep your thoughts coming!

Well, I think whatever you decide you can't go wrong with that bedding. I just hope you put some color on the walls to help show it off. Good luck!