This I got from a website by Arvind Gupta. I am just making it pocketable.

I have been playing with these things since my childhood. Students can make and understand chemistry from these models.
It just cost me Rs 50 =1$ to make few of them

So let's get started.

Step 1: Things Required

Not much is required to make this project

Match sticks
Cycle Valve tube
Scissors
Large sewing needle (i just used a sharp tool here)
A tin can (I am using nivea can as I don't have access to altoid can where i come from)

Step 2: Prepare the Parts

Cut the valve tube in 1 inch pieces. Cut a little more than you think required.
Cut of the lighting tip of the match sticks.
These things will be the base of the project. So make as many as you can

Step 3: Prepare the Complex Parts

Pierce a hole in one of the valve tube pieces. Pass another valve tube through the hole to get a connector of 4
Pass another valve tube to get a connector of 6.

Step 4: Packing Everything

Put everything together so that nothing is lying around.

Step 5: Using It

This is a basic model that can be made. In this model I used just the 2 point connector. But you can use 4 point connecor or 6 point connector. Just leave 1 connection loose without the match stick.

Play around and have fun!