Good Cucumber examples in the wild?

I've tried Cucumber for a few projects a couple of years ago and am looking to give it another go. I don't really need another "Beginning Cucumber" article. Instead, I'd like to see some actual uses in the wild—one's that other Cucumber users would consider idiomatic and antipattern-free.

So, in your opinion, what are the best examples of actual Cucumber specs in large projects?