> My banks provide different colour options for their cards.

I'd like to take a moment to appreciate a tiny "UX feature" that punches above its weight: When multiple physical cards have different base-colors to their plastic, visible along the edge.

This reduces how often you even need to check the face of a card. With several in one sleeve/stack, you can slide out the one you want, knowing that (for example) blue is credit, green is debit, red is the shared family one etc.

With my kind of wallet, if I had to pick I'd rather customize the edge-color versus the faces.