I'm considering doing a 365 of food, with the caveat I can't do a meal/food more than once
Aside from the angst when I have when no inspiration, the second biggest problem is when I'm doing something I like, such as the smoke photography, I can't pursue it because I need to tear down the setup ready for something else the next day! I'm trying to do a ton of celebration themed shots and the first just wasn't working - I wanted to try more ideas but it was too late and had to do a very average 365 shot instead.
Current plans on my list are
Project 52 - quite a strong contender.
Project 50 - 50 days, 50 shots all with a 50mm lens. But I want to be full frame before I do this and I ain't doing it with film. This will be HARD.
100 Strangers - coming close to starting this, I want to approach 100 strangers on the street, chat to them, shoot their portrait then host a custom website to document the experience. The thought of talking to a stranger to ask for their picture is quite simply terrifying so shall be an immense learning experience.
I think I'll finish this 365 first though