GREEBLIES!!!

What are GREEBLIES? That is a term coined by George Lucas for any generic detail parts to go on the models for film. What were they made from? Just about anything, but especially pilfered from existing plastic model kits. Model studios would have a wealth of various kits that were sacrificed to supply detail parts for everything you'd see on screen. 

Now, you have people putting out STL files so you can produce your own greeblies with a 3d printer, and save the expense of the kits.  

Find some files HERE:  

https://www.thingiverse.com/rob_jedi/collections/greeblies