Have you considered doing a more simple mug? I would be very interested in purchasing a mug with fewer currency logos on it, while potentially still keeping a bunch on there; there are just too many cryptos to count and these 230 are probably more or less arbitrary. It would be more interesting to me if there were a few key players featured on the mug, the top dogs with the most technological innovation being brought to the table.
I almost just checked-out, but then I was thinking that I will give your other products more of a look before I go impulse purchase something I don't really love. The black logo definitely looks better to me, but maybe if we could get it down to maybe 12 currencies and have the logos different sizes depending on their market cap or something.
Thanks for the suggestions, it's possible that there will be variations, but I don't think it will happen soon to be honest. Thanks for checking out the store.