Foam insulation serves as backing material for a DIY cornice board valance. This will work great for arched window.

SF Gate

How to Make a Cornice Board Valance From Foam Insulation

homeguides.sfgate.com

DIY Roman Shades and Window Panels

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mehtajee.com

DIY Cornice

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flickr.com

A great visual showing the difference in mounting a drapery rod higher and wider on the same size window.

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Laura Z

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

i should be mopping the floor
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ishouldbemoppingthefloor.com

DIY - put a shelf over a window & use the shelf brackets to hold a curtain rod.

marthastewart.com
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marthastewart.com

How to Calculate Fabric Yardage for Drapes & Curtains.

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xoimagine.com

Tip - Use Velcro to attach your own black-out lining to curtain panels.

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buzzfeed.com

Where to Install Drapery Hardware.

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camillemoore.com

How to make your own curtains with a blackout lining.

Sew Lined Panel Drapes | Just Melissa

midwestmagnolia.com

What To Do When Your Drapery Panels Come Up Short.

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beauxrevesamore.blogspot.com

Adding Decorative Trim to a Curtain.

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sasinteriors.net

Tip - The minimum break for drapery panels that hang to the floor is 1".

housebeautiful.com
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housebeautiful.com

Tip - use velcro to attach your own black out lining to your favorite curtain panels

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touchofclass.com

How to measure for Roman Shades.

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store.lynnchalk.com

How To Hang Draperies And Curtains Like A Designer

How To Hang Draperies And Curtains Like A Designer

addicted2decorating.com

How to hem curtains.

The Shabby Creek Cottage
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theshabbycreekcottage.com

How to Hang Curtains.

How to Install Curtains

newsilike.in

Easy sew Ruffle tutorial | My Uncommon Slice Of Suburbia

My Uncommon Slice of Suburbia
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myuncommonsliceofsuburbia.com

Nate Berkus: How To Make A Valance

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thenateshow.com

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!

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ourbarbiedreamhouse.blogspot.com

How to Make a Straight Curtain Hem the Easy Way.

Plum Doodles
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plumdoodles.com

DIY No-Sew Roman Shades using miniblinds.

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goodlifeblog.org

Adding pleats to rod pocket curtains --DIY Tutorial ~~

How to pimp out your store bought curtains

shannonberrey.com

How to make Arch Top Pleated Drapes - Tutorial and Pattern Templates

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draperyeducation.com