As we all know, pistons have been out for the Xbox 360 Edition for several weeks. In that time, I'm sure there have been some impressive piston creations that have been made. I know some have built rotating light houses (a/k/a lag machines). There are no doubt numerous automatic/hidden doors that have been made. A few have probably tried their hands at elevators (difficult in this edition given the lag). Personally, I'm far from fully understanding redstone, although I find that the image at the link below is a good starting point in understanding the logic gates that form the basis for most redstone/piston machines
Thus far, my only creations have been fairly basic: (1) a hidden sliding door that leads from the floor of my pyramid to a ladder that leads to my vault; and (2) a sand generator. This weekend I'm going to be working on a pool at my ranch house that can be completely hidden with the flip of a switch. Don't know if I will succeed, but it will be interesting to work on it.
What have you created? I'd love to know.