With regards to the aquascape (since this is the only thing I talk about anyway lol)-- it's hard to say much. I think it's got to start with you-- namely, what are you trying to make? Even if you had the vaguest idea like, "I want to make a forest with crypts"-- I bet a lot more ideas could be put forth. Dennis and the other members probably feel the same thing as me in that we don't want to impose our own ideas on you for a beautiful blank tank.
If you gave us a basic "genre" though, people might be able to offer up ideas as suggestions.