It took around five minutes to work out the best configuration, and another five minutes to make. I will now save you five minutes by showing you how to make the RECYCLED FISH-TIN DESK TIDY.
Step 1: Materials, tools and constructing the base level.
Wash the tins out well. Wash them out VERY well. No-one likes a desk tidy which smells of fish.
Turn one of the tins upside-down and run a couple of lines of hot glue down one of the long sides. Hold the tins together until the glue cools. Don't hold too close to the glue - those tins are excellent heat conductors.