Which leaves us with the throne and the idea is out there already. Sonor offers a cajon with upholstery.
Overall the percussion sector is rather innovative and the day where you would find on the off chance just a single lost cowbell on a set, are long gone. World beats - but also grooves we are all familiar with from sequencers and drum computers demand a variety of instruments on the set.
Experiment and be playful. Just look at cymbal stacks, developed as signature models, in order to produce an artificial , and sometimes even a broken techno sound.
Metal plates, tins and tubes and we are not talking chimes here rather their raw colleagues and other scrap have found their way into many a set.