Has Monzo ever considered offering a range of different colour cards? 
Yes - they are currently available through Monzo Plus
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Choices are Hot Coral 
(available as standard to all Monzo users), Midnight Sky 
or Lagoon Blue 
(these are options for Plus members).
Indeed they have. It’ll cost you £3 per month for 12 months. And if you like it, it’ll be £6 per month thereafter.
Just a counterweight to the positivity, I guess.