Set this paper tube on a piece of black paper and trace around it. Cut out the circle. This will be the cap on the paper tube that fits over your lens. Use a paper punch or Xacto knife to cut a hole in the middle of the circle. ... I used a knife to cut a cloud, asterisk, and tulip. Tape the paper circle to the tube to form a cap that will fit neatly over your lens. To test this little project, I needed some tiny points of light, so I threw some Christmas lights on a ...