A randomize button for each section would be good.

You can't always predict what is going to look good using sliders, if there was a randomize button for each section you could quickly try different values. If a random category looked good you could fine tune using existing sliders to get the perfect pattern or look and then move on to the next section. Curve #1, curve #2, surface options, balance, bending and colors could each have a random button to quickly see different effects without having to know what would look good in advance.