Wow that sounds very nice!! I wish I had the space to do something like that for mine but she's already 3 feet and growing =) I think a pond would be nice so Reptar can dip himself in the water when ever he wants and you can put some big wood branches in there like the one in your picture and artificial leaves. I just ordered some artificial leaves and a big half-log from thatpetplace.com and it was pretty inexpensive compared to the pet stores. Try searching on there for cage decorations and I think they might have some misters and other things I'm sure you would like.

Here's a pic of Tigeris when she was 2 feet like yours =)