I've had a pretty good experience making various bitters from scratch over the last year.
I also made a nice Falernum that really makes my tiki drinks sing.
As we get into citrus season I have resolved to make a REALLY good citrus bitters.
Have filled a jam jar with Grain alcohol, and plan on zesting (with a microplane) various citrus right into the jar as we go through citrus season. My local green grocer has promised me some bitter oranges soon, which are obviously key. But I already got some nice red navel oranges and tangerines that had pretty fragrant zest on them, so into the jar it went. The liquid already has a nice pale orange color. My goal is to have a really nice strong tincture by February or so which I will blend into various bitters...
Please chime in with your own success making citrus bitters.