As per your requirement, you can buy online home decor and home furnishing products like curtains, sofa covers, divan set, bed covers and more products from https://www.housethisindia.com that provides best online shopping offers and discounts.
First of all, that is a very beautiful coordination. I guess white
or orange will look good. You can check out online to find another colour to
pair with these. This link may help you: https://www.homedit.com/colors-to-pair-with-blue/. At my
place, the wall is white, the sofas are brown and my curtains are fuchsia.