Could not have said it better myself!Ducatis should be red or Yellow! There is nothing subtle about these things so don't try to civilize or disguise them. The paint should be as bold as the bike, but not garish.
If you absolutely have to have two tone, red and white. A few black or silver accents are ok but should not override the basic color.
I don't even like the tricolores. If you have to show the Italian flag, do it with small badges or stickers.
That being said, I will readily concede that personal opinions and free advice are worth exactly what they cost, but you asked for them.