Awesome! After some searching I've worked out how to change the effect (ctrl +shift click in buy mode, then type in the code). I used one in my Asian build, to immitate the fog around the bottom of the waterfall, but used fountain objects to get the waterfall look. Using the fog emitter will be much cheaper
That said, I think it was easier to get the fountain where I wanted it to go because I could see the effects as I placed it and didn't have to switch to live mode.
It's a VERY long list of effects, so I can see I have some work ahead of me to test out all the options for maximum possible build usage. I'm trying to stretch my building creations by using things in ways that they're not normally used.
Most of the things I've seen today that I don't have are from the stuff packs, so I'm off to town to buy me some stuff packs as soon as my tax refund comes in!