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.
Step 2: Adding the Second and Third Levels.
When the glue has cooled, turn them the right way up and glue them to the other pair of tins so that they slightly overlap the open tin.
Take the final tin and place it crossways at the back of the second layer. See where it sits best, then turn the whole thing over and dribble hot glue around the edges where it touches, especially where the lower two cans meet. Leave the whole assembly to cool for a while.
Step 3: Finishing and Ideas for Expansion.
You now have a useful little desk tidy or small component holder made of recycled materials. If you collect more tins you could extend this indefinitely by gluing several units together, or be daring - come up with your own fish-tin configuration.