Foam insulation serves as backing material for a DIY cornice board valance. This will work great for arched window.
DIY Roman Shades and Window Panels
A great visual showing the difference in mounting a drapery rod higher and wider on the same size window.
12 No-Sew Window Treatments ~ Great no-sew window projects including valances, cafe curtains, etc. Link @ http://www.ishouldbemoppingthefloor.com/2013/01/12-no-sew-window-treatments.html
DIY - put a shelf over a window & use the shelf brackets to hold a curtain rod.
How to Calculate Fabric Yardage for Drapes & Curtains.
Tip - Use Velcro to attach your own black-out lining to curtain panels.
Where to Install Drapery Hardware.
How to make your own curtains with a blackout lining.
What To Do When Your Drapery Panels Come Up Short.
Adding Decorative Trim to a Curtain.
Tip - The minimum break for drapery panels that hang to the floor is 1".
Tip - use velcro to attach your own black out lining to your favorite curtain panels
How to measure for Roman Shades.
How To Hang Draperies And Curtains Like A Designer
How to hem curtains.
How to Hang Curtains.
Easy sew Ruffle tutorial | My Uncommon Slice Of Suburbia
Nate Berkus: How To Make A Valance
Window Treatments: How to choose the right Scale & Proportion, correct length for Pleats, Tieback placement and proportion, etc.. - an entire page of extremely helpful tips & guidelines!
How to Make a Straight Curtain Hem the Easy Way.
DIY No-Sew Roman Shades using miniblinds.
Adding pleats to rod pocket curtains --DIY Tutorial ~~
How to make Arch Top Pleated Drapes - Tutorial and Pattern Templates