Duvets For Sewing Projects (CT1)

I have two king size duvets where one is all white and one is pale sky blue on one side and white on the other. The blue one is made up of panels 9" / 7.5cm wide. Both are heavy cotton but have slight paint splashes on them. They have both been washed. They could be used for sewing projects, e.g. cushion or curtain backs, but not as duvets.