Coin ideas, mmmmh, my name is coin@coin for a reason LOL
Precious metals I agree with BTCC here, anything to have them shipped safely and without killing it on customs fees I'm in favour.
Maybe other metals like brass, copper, various others which are unusual but could be original. Have you considered plating in silver, gold, antique brass, etc?
2 or 3 coins sets in different finishes, seems to be getting some traction from several current manufacturers. Plating shouldn't be an issue for shipping.
Have you seen the Satoricoin? Why don't you release some inexpensive "Casino Chip" like BTCC coins with low amounts, sold in sets of 10 or 20.
With some really cool designs! I'd love some of these.
Smaller denominations are best for my pockets too.
I think I've mentioned this before but a 12.5 BTC set made up of 5 coins with different denominations: 0.50, 1, 2, 4, 5 BTC, all from the same block totalling 12.5 BTC,
and if block reward is over 12.5 one of the coins gets the extra, each set will have slightly different BTC amount.
3 stars 12.5 BTC Blocks, but as someone else mentioned, even 1 BTC blocks or smaller denomination sets of blocks.
I like the idea of smaller denomination sets too from as low as 0.05 up to 1 BTC.
Also seen you guys can mint, some limited edition sets especially in lower denominations following a theme or an event... with different designs, numbered.
Animal series, zodiacal signs series, Chinese calendar series, PokemonGo series... I mean so many ideas out there. Can even have a form on your site to submit ideas the better ones get a prize
Also don't forget your coins look pretty nice I am so sure many would be willing to buy BTCC DIY coins.
Oh and finally "block rewards on demand". Someone pays for a 12.5 block or even 5 BTC, or 1... And they can specify the address where it is sent to.
They get the coin or block with hologram (DIY version) and they assemble it themselves.