We had to move one of our down spouts because it was in the way of the deck. If you're not afraid of heights it is ridiculously easy to do. Hopefully all of your down spout locations make more sense than ours, because ours are terrible. Now that I know how easy it is, we might consider moving some of the other ones as well.
We originally had one coming off of the back corner on the morning room.
As you can see, it conflicts with the deck, so we had to move it to the side of the morning room. The side is a more sensible location based on the slope of our lot anyway, and it uses less pipe so I'm not sure why they did it in the back to begin with.
The existing configuration used two B-type elbows at the top:
All we had to do was take off the whole thing, replace the two B-elbows at the top with A-elbows (which we purchased for $3.50 each at our local hardware store) and put it back up. The pieces are only held together by one screw at each joint so it's very easy to take apart and put back together.
Voila! Now our down spout is out of the way of our deck!