Glenn, Generally one would make their own pattern.
send me your idea and I will help you with it... Another idea is to buy a pack of beer, some glue, a scissors, and two large pizzas. Cook the pizza, drink the beer and cut a pattern out of the pizza box, glue/tape on extra paper to make the shape of the lantern you want. Then cut the pattern on a "seam" and ta da...you have your pattern. Really, just take some stiff paper and work up your design. From there you can actually see where to join the "tin" to make the lamp you want.
P