ok, ok, sorry about the song virus, couldn't help it...
In all seriousness, I think the following things make a door logo look good:"
- Large enough to cover at least 3/4 of the height of the door
- Some color
- Hand-lettering
- SOME sort of design that smells vintage in the background.
- The phone number with no area code (by 67, most places no longer had the switchboard prefix - but if you like that approach, another option is: "BE0-774"
Now I'm REALLY dating my self. Hint: BE=Bensonhurst)
- And, last but not least, an "Est. 197x" or something like that. Pick a special year for yourself, doesn't really matter, or this year!
- And, REALLY last, but not least - if it's not going to be patina'ed, include some gold or silver leaf.