I have one recycling tip for turning 1/2 gallon square milk or juice containers - or any other cardboard food container - into toy building blocks.
Cut off the pouring end of two rinsed, and dried out, milk cartons - then push the two open ends together.
Pushing one carton inside the other, this doubles the strength of your new block, and closes the ends.
Photo credit: Sand-filled drinks cartons being used as toy building blocks by the children, by neonzu1, on Flickr
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These are very lightweight and safe.
You could cover them with contact paper for a 'fashion' finish, but I found the children enjoyed sorting the cartons by brand-names (the colours on the outside).
Photo credit: make-baby-stuff.com
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I started this project while pregnant with my first, eight years later we have quite a collection and it's always a favourite with visiting friends.
They make great walls, forts and cages for kids, as well as cities and roads for small cars.
Thanks to Linda for this great Frugal Baby Tip!
• Upcycled Baby Blocks Instructions from Packaging
• How to Make Cardboard Blocks
• Kittrich Corp Con-Tact Contact Paper
• Melissa + Doug Deluxe Jumbo Cardboard Blocks
• Imagibricks Rainbow Blocks
• PlayBrix Cardboard Building Bricks
• Frugal Baby Tips can be found on Facebook and Pinterest!