Wayne's prompts inspired me to start writing on GA, and I have three collections of prompt responses in my story list. The first prompt I posted was a story about a little girl finding a 'kitty' and the subsequent consequences. Both Penguin and Alex's Legacy were inspired by prompt responses. Those are two of my favorites, as is the one I wrote about the zombie apocalypse.
It's really hard to choose a favorite, but I had a lot of fun writing my response to Prompt 310 -
Even though I've slowed way down on writing prompt responses, I looked forward to them every Friday. Wayne has left us a treasure trove of inspiration.