Well, if you cannot think of somewhere to post something that is related to an idea, then do this. If the idea is going to turn into a game possibly, more than likely, and in the near or oncoming future, then post it in the Development boards with the correct tag. If it is just an idea, post it in the Graveyard section because more than likely it will die and be forgotten. However, if you are unsure still, then just post it in the Graveyard, the staff will move it if it is in the wrong section and it will all be fine.