mmm as for the mister i have an idea! Remember its just an idea =)
Take a piece of styrofoam and carve it out somewhat like a rock or whatever you like (let your creativity take over haha)
Then use grout to cover it and make it look neat and nice.
This video is a better demonstration that i can type out. Its from AAAfrogs and building their water feature. Maybe try to same method just put your own twist? I dont know! hahaha but check it out!
Dont forget to seal it! =)
YouTube - ‪Part 2: Building A Vertical Dart Frog Vivarium HD‬‏
-Kevin