Make this simple spiderweb with a white paper sack and a roll of thin black tape. Stretch the tape in alternating lines so that they cross in the center and stretch all the way to the top, sides, and corners of the bag. Then, add shorter pieces of tape to connect the lines. Start from the center and work out, making connecting lines spaced an inch or so apart on the bag until the web pattern is complete. Use glue to add a plastic spider to your web, and you're ready to go!