Cardboard Furniture.

Portable Cardboard Art Table:

This lightweight, portable cardboard table designed by Liborius Reykjavik offers an ergonomic plane to work on.

Zastool:

Link

Cardboard Boxes For Tables, Chairs, Shelves.....

"Each Idea* product is a cardboard construction which opens and constructs into itself, creating the shelf or chair or whatever it says it is on the box. The box is what it is!"

Speech Bubble Cardboard Coffee Table:

Speech Bubble cardboard coffee table by Leo Kempf.

Box Table:

This one is really a good one!

The itbed:

Designed by the Swiss studio Design it, the itbed is only a bed when you want it; its a multi-faceted piece of furniture that one can sleep on and can be rolled up for the want of space.

Multipurpose Box:

Well what can be said about this one ; )
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Cardboard Gate:

Link.
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Bedding Set That Looks Like Cardboard Boxes:

This cotton bedding set that's made to look like a folded cardboard box. Available here - link.
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Cardboard Cafe:

B3 Designers constructed a one off the cardboard cafe, during the London design festival.
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Back Side Flip 360° by O-S Architectes:


French architects O-S created this temporary installation made of cardboard boxes in Montpellier, as part of a Festival.
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A Store With Cardboard Interiors:

The interior of the store is composed almost entirely of cardboard. "Located in one of Melbourne's most interesting precincts, the Flinders Lane store interior is made entirely of industrial-grade cardboard; from the display shelving,.."

Other Posts:
Art With Oranges.
Print Ads Using Illusions.
Creativity With Plastic Bottles.
Interesting Ads Using Elevators.
The Hidden Truth Behind Hotel Drinking Glasses.