This is a Javascript + HTML application to render domain coloring images for complex polynomials.
You can pass a polynomial as an URL parameter, like this: http://allanino.me/domain-coloring/?p=z^5-z^2+2z-2*z^3.
We also included a Mathematica notebook with functions to render similar images. This have the advantage of being possible to draw images for a wide range of complex functions, including the Riemann zeta function.