You can put a logo or image on just about anything and if it's possible it makes it a promotional item.
Almost anything can be sourced and branded. Some of the many products you can brand is only limited to your imagination, ie egg timers, medallions, wooden boxes, torches, USB’s, bottled water, nail files, playing card tins, mugs, highlighters, chocolates, chocolate slides, sticky notes, boomerangs, window decals, even a piñata and of course pens…the list is endless