I'm thinking about my next game. It needs to fill these 3 requirements; simple, unique and fun. So far I have thought of ideas that only meet two of those requirements. I acknowledge that is a tall order to come up with an idea that meets all 3 of them, so I'm also thinking which of the two requirements are most important. I'm leaning towards simple and fun but I can see that kind of game passing with ~3 score, so that doesn't motivate me much. Definitely won't make unique and fun because that is so much work, hehe :). Maybe simple and unique? But if it isn't fun nobody is going to play it :P. Okay I'll get back to thinking.
(feel free to post an idea in comments if you want to, I may or may not steal it, depends how good it is :))