Models of poly-disperse form factors of hard spheres, core-shell spheres, cylinders, core-shell cylinders, vesicles and ellipsoids are available. Further models are currently under construction.
References:
Narayanan, T., Synchrotron small-angle X-ray scattering studies of colloidal suspensions, Lecture Notes in Physics, (Non-crystalline diffraction) Ed. T. Ezquerra, 776, p 133-156 (Springer, Berlin-Heidelberg, 2009)