Carrying on the theme of English regions, if it were to be divided into smaller areas than the current official regions, perhaps Devon and Cornwall could be one on their own, equating roughly to the ancient Celtic Kingdom of Dumnonia.
I think the flag is a no-brainer – a combination of the two county flags, but I’ve done a coat of arms too. It combines elements of both county arms, along with, in the crest, a tin mine (once an important industry in both counties), the county flowers (primrose for Devon, Cornish heath for Cornwall) and a coronet representing the semi-autonomous nature of the old Stannary Parliaments in both counties, and the Duchy of Cornwall (which occupies more land in Devon than in Cornwall!)
The flag of Cornwall and arms of Cornwall County Council:
The flag of Devon and arms of Devon County Council:
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