If you are ordering new, the only limit to the colour is your imagination.
Personally, I'd think of cars that stand out to you as personal favourites and consider what colour tones they were in.
Some personal thoughts that I have mulled over when ordered a factory Morgan:
There is a reason so many concept cars used to be a tone of silver or metallic grey - it shows of the lines of a vehicle better than any other colour. Lighter, metallic, colours really do accentuate the iconic shape of a Morgan.
Darker colours have their own appeal, often feeling more 'retro', period or heritage (however you choose to describe it!) and no metallic adds to this even further. When paired with a mid-tone interior, for instance, saddle brown, this feeling of heritage and continuance is only enhanced.
Lighter metallic colours also work well; often for similar reasons to why silver helps to show off the lines. My first Morgan was ordered in a Bentley colour called Silverlake Blue, paired with Prussian Blue (dark navy) leather and light wood. To my eyes, it looked superb.
There in lies one of the best parts of ordering a new Morgan, there really is no wrong answer and it boils down to personal taste and preference!
