what you need to do is set up a custom pp attribute that will randomly call the different index numbers of the objects in your instance. i usually call it "randindexpp", and the creation expression for it is : paricleshape1.randindexpp = rand(0, "the amount of objects you are instancing" + .9) so if its 6 objectsparicleshape1.randindexpp = rand(0,5.9) ; your first object's index number being "0" the ".9" at the end allows your last object to be chosen more frequently in the cycle. finally, in the instancer portion of your particle shape's attribut editor, make sure to select your new custom attribute in the drop box of the "object index".