hello
well, I'm interrested to know too, anyway I've found a trick to downsize balls to 1mm
I just use the minimum size of the ball, 1cm then put a hole in it (from 10 to 50, equivalent to 1mm to 5mm) I just need to set the exterior texture to transparent and the interior as I need (using "select one face" in the menu)
another tip..... to reach the inside texture, you need to open the ball (half is better to select)
ok, it's not really a tinyprim but it works ans you can do the same with rings and cylinder (just a problem with cylinder... when using the hole function, the tinyprim made that way stay open on side... didn't find how to solve that.. if anyone as a clue?
*adding* found this: http://www.mermaiddiaries.com/2007/05/day-223-creating-jewelry-part-3.html
nelly