After cutting the panels the only thing left to do was sew some straight seams. Pretty easy! I also had shear panels to finish the look.
I'm sure you're looking at that photo and asking, "What is that valance hiding?" Well, here's the answer:
I hung the sheers and curtains all on one rod and covered the top with the valances that came with the cottage. The valances got a fresh coat of paint and the project was finished.
Total cost: $0 !
Apologies for the photos - it's difficult to take pics of windows with daylight coming in.