Change the variables, but not while it's being generated. Click the flower to change color of all petals if color change per petal is 0. You can't do it with gradient on, but you can turn gradient on and off at any time. Click the center to change the costume. Press space to change the type of petals at any time. When the flag is clicked it will generate. Command M if it gets choppy.
https://www.kaggle.com/c/leaf-classification for background. Figured cold is coming up so we need spring! :)