Refresh the page or click the Random button to choose a random color scheme unrelated to the other buttons.
Click any color to draw a new pattern in that color.
New pattern will create a new pattern in the currently selected color.
This could be used to create background images for a modern web site. Since it is a vector image, it could be exported and resized.
It might be nice to add controls that let the user specify an exact base color in RGB or HSV, a specific level range (dark to light), the amount of randomness that will be introduced, etc. These would make a good follow-up project.
There are brief instructions under the help ? button.