Mastering The Closet: An IKEA Pax Hack. DIY Built Ins - practicallyspoiled.com
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Space saving organizational ideas for the walk-in closet
I just can't get enough of this peg board in the closet thing!
Hang IKEA spice racks on the back of the closet door to store bulky cleaning supplies.
Create a New Look for Your Room with These Closet Door Ideas and Design Ikea, modern
Discover clever tips and tricks for turning a spare bedroom into the walk-in closet of your dreams. For more organization tips and decorating inspiration go to Domino.
Something like this would be great to add storage to the girls' closets...the 'base' is the same Ikea dressers you already have
Curtain panel, tension rod = replaces bi-fold doors on closets. I've always done the bar on the outside and curtains over the framing. This is a nice alternative without drilling required.