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I think we will then work through the elements - Bitcoin water (could this be linked to Hydro Mining?), Bitcoin fire(that just sounds too cool).
Then the obvious next step would be fantasy creatures - Bitcoin Unicorn, Bitcoin, Elf, Bitcoin Gremlin and Bitcoin Fairy ( a bit like the tooth fairy but instead of teeth you leave gold under your pillow and she replaces it with BTC into your wallet)

I've already suggested that after Bitcoin Diamond, they could get BitCoin Swag and BitCoin Bling.