Its costs virtually nothing to make, yet it is absolutely beautiful.
Using abrasive paper and/or steel wool, rub off the paint/printing on the outside the can.
This doesnt have to be perfect, as tthis will be the inner surface of the finished box.

However, skipping this step altogether makes it quite hard to see what youre doing in subsequent steps.
The bottom box can then be lined with fabric or felt glued into place, or self-adhesive flock.
Watch how this guy with AtomicShrimp does this cool project in his step by step tutorial.