Sean Ragan made this lampshade from soda pull tabs, interlocking them in an interesting way:
Careful study of the photograph will probably tell you all you need to know about the chaining technique. Each tab is bent to approximately 120 degrees and then snipped at the top. The top loop of the tab is then threaded through the bottom loops of two adjacent tabs on the row above. Rinse and repeat to create mail.
From the pages of CRAFT, Vol. 03:
“Pull-Tab Crochet,” by the designers of Escama, pgs 118-119. Buy the back issue in the Maker Shed.