I still say you should do the Thorny Devil
God Bless,
Joshua
Just actually saw the picture (missed it earlier, must've not loaded) and it looks very interesting, I might do with instead since it looks very easy to do and I heard it's colour changes with warmth, so obviously it's colder at night so it gets darker with cold and lighter with warmth so it works with day and night.
Wow I just saw a video on youtube and it showed how to makes water fall on it and makes it travel to its mouth. And how spiny it is and the false head. Looks amazing.