There has been a window at 203 West 14th Street, right above the Donut Pub, made of blue and green stained glass, in some kind of floral motif, half-broken and bulging. I have admired it whenever I've gone by. Ephemeral New York called it "one of those hidden gems New York is famous for; you could walk by it a million times and not realize it was there."
I couldn't find my photo of it, but Ephemeral got one:
And that's lucky for us, because the last time I went by and looked up, I saw the stained glass window is gone.