Setting out to make a single sheet flower-ball, I began with a simple pentagonal flower tessellation, which on it's own is a nice, low-intermediate model. You can fold a bunch of them and make an arrangement.

A fourfold symmetrical version of the Fivefold Flower tessellation. Origianlly designed as a test to generate the Flowercube, it offers creative possibilities of its own.

This rose that features fivefold symmetry for a more natural appearance. The golden ratio is replete in many natural plant forms and the rose is no exception. The method for developing the pentagon is approximate but very accurate. The center of the pentagon is at the center of the paper.