Oh, another personal favorite!
This one actually started out as a design to paint on a backpack (I used to do that a lot, some years ago), but it never made it past the doodling stage at the time.
I eventually turned it into more than just an unused idea. On this version the cans were actually modeled on 3D software to get the perspective and proportions right, but most of the work was painting and applying textures on Photoshop.