Following on MoparMadness's suggestion, you could also try 'pearl' or 'beading' tweezers--they have little hemispherical depressions on the insides of the jaws, for holding round thingies...but they also give a little bit better grab to pretty much any irregularly-shaped object...like most tiny model parts.
Also useful are the variety of 'sticky' grabbers like the pencil, Grabit-Stix, and similar items. (The 'glue dots' used by scrapbookers, stuck to a toothpick end, will do the same thing rather more cheaply. A roll of 100 may last a lifetime.)