Lol, I was going to write an answer for this, but apparently I already did!
In addition to what was said in that other post: ideas will come when they come. The trick is to write them down. Any time you get a thought for a story, add it to your ideas document. Then, when you have the time to write, but can't think of anything, you can go through your ideas document and start combining and reviewing your different ideas. This is also useful for getting un-stuck when you have writer's block.
Eventually your ideas documents will become so lengthy that you need five or more of them organized by idea type, but that's another problem.
