Thank you, KAS. Truth be told, I posted that because I didn't have any clear thoughts of my own. Except for the Masi which certainly needed repainting I've never had a bike for which the question mattered. I certainly don't have the skill (or the time to practice) to do it myself. However I have a few ideas do now.

Whether you spiffy up the headbadge depends on what else you do with the bike, whether you intend to paint or "restore" it. If you intend to paint it (not such a bad idea if vjp is correct that it already is a repaint), then by all means do the headbadge too. But it might be really cool to do just the headbadge, a sort of personal statement about the bike's inner beauty.