These are some experiments with palettes and the start and increment for the biological growth algorithms. I've also a range of Galaxy algorithms (using the gravitational equations as a basis for long term stability). The origin of these algorithms comes from a symplectic integration equation from the New Scientist back in 1994 (ish). However since then I've been experimenting with equations from interactive growth (e.g.: using a growth function upon the computer screen similar to a "petri" dish and mould growth.
These are all variations on a theme from one set of equations and different palettes to display the details.