So since you asked for decorating advice I figured I'd finally chime in with some advice. Find something for a centerpiece that shows the long beauty of the tank. Here is my tank.
I managed to find that piece of Mopani wood at Petland and as soon as I seen it I knew it was going to be perfect as my centerpiece. It was slender like the tank was and had just the perfect height to fit the tank perfectly. Then I just added the live plants around it and I am really pleased with how it turned out in the long run. The only thing I have really changed about it is the back left corner is very bare now as I have just let the Anacharis float, or gotten rid of it.
There are older pics of the tank when I set it up that shows the progress of the tank a bit better.