You will need A4 sheets of colored paper, a pair of scissors and a stapler. Cut the paper crosswise into thin strips. Fold each strip in two. The first one is the hardest 
Fold two pieces at the middle and staple them together. Turn the ends of the outer one back and staple them tothe next folded strip. 
Fold two pieces at the middle and staple them together. Turn the ends of the outer one back and staple them tothe next folded strip. 