I've done probably three logo designs in the past seven years, but lately I pumped out two, and the sentiment seems to be that they'll be becoming an ever more common part of my job.
The first I did is for a charitable institution that will be opening its doors in Peoria, Illinois once all the balls roll into place. It is to be rehabilitation center modeled after San Francisco's Delancey Street Foundation. Its board of directors asked me to come up with a logo, and after a few drafts they settled on the idea of emulating the soon-to-be-iconic gabled roof of the building chosen to house this project.
The final logo ended up like so:
As it turns out, there was a mis-communication; the company already had a logo, but they liked mine so well they decided to ditch the old one and move forward using the new one.
I had another incident like that last year with a company I thought I was designing a logo for, but instead I was trying to reproduce an existing one, sight-unseen. What I thought was creative input from a manager was instead recollection of what he'd seen on the gas station sign.
Navigating by the creative direction I'd been fed, I came up with what was almost exactly their very logo. However, since I thought I was doing an original creation, I had taken some more aesthetic detours along the way, and I think to this day that I designed one that's way better than what they've been using:
Jackson Express, if you're reading this, you're still always welcome to use mine instead. You know it's snazzier.