I made Keep The Light Alive (which eventually became Giant Centipede) on day 1 because the idea has been floating around in my head in various forms for a long time. I will not say anything more about it in case it gets picked up because I want to avoid the communication rule.
I picked up Fantasy World for day 3 because I thought it would be easy to expand upon and could lead to some interesting stuff.
I skipped Day 4 because I had to take my near-blind mother to visit my cousin and look at their new house. And I skipped Day 2 because I'd exhausted myself on Day 1.