This is a way to build 3D shapes using toothpicks and marshmallows. You could also use Blu-Tack and straws or Play-Doh and raw spaghetti strands.
You could construct a bird house out of icicle sticks!
You will need:
Lots of icicle sticks (you might need to save them up for a while)
Glue
String
Paint or pens if you want it colourful.
Here's the link to the tutorial:
https://www.youtube.com/watch?v=zu6wSVLLgUk
Try making a castle out of cardboard. As small or large as you want!
You could construct a den in your garden
Or build a tower out of plastic cups
I made some 3D shapes with straws and Blue Tack
I found out this one is an octahedron
His many creations.