This DIY macrame plant hanger is one of those unicorn DIY projects - something that can appeal to all ages, only uses a few materials and crafters at any...
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DIY T-shirt plant hanger. See full instructions here : http://shopwalkinlove.com/t-shirt-plant-hanger-diy/
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Pet gate made of PVC pipe. More
PVC pipe is one of those ordinary construction materials that is cheap to buy, readily available and easy to work with. You can cut it, paint it, drill it and glue it easily.
LifeHacker: Make a kiddie/doggie gate from pvc pipe (or garden fence?) : )
9 Creative Uses for PVC Pipe
Lattice and cheap PVC pipe from the hardware store - would work for displaying so many different things