How do you guys go about coming up with a new map and developing layouts and such? I've figured out as much of hammer as I think I need to at least start a map, but then I realized I have no ideas and I can't make myself come up with them. Sketching layouts does not work for me, I just can't come up with a layout that way. I really really want to make my own map, but I cannot think of a single scrap of concepts to use. What do you guys do to get ideas for a whole map?