This function will create instances of fill-objects with the options you provide. You can set an arbitrary number of fillelements which will be used in an alternating order. For a list of possible options in the options array please refer to the fill element class you wish to use (e.g. Image_Graph_Fill_Solid). A reference to the fill objects will also be returned by this function. Using that reference you can access methods provided by that fill object, e.g. to customize it.