For this one, I created the base fountain in SketchUp.
I exported all my SketchUp drawings to a PDF and opened them in InkScape. I then added the "Chtulhu" face to the back wall of the fountain using InkScape. I probably could have done something in SketchUp, but I find for drawing more detailed elements that InkScape is easier to use.
I based my Chtulhu design on this "Skid-Head" image I found online.
Once I cut it and assembled it, it looked like this:
I'm going to try and add "fake" water to it once it's painted.