In some cases, gnomes and halfling minis are really close.
As for the dragonborn, you're SoL apparently because wanting a concept artist to do a vulcan mind meld with you from across the earth in order to draw up exactly what YOU want a dragonborn/half-dragon to look like is completely unrealistic.
Seriously, some times expectations are just so ridiculous and/or steeped in edition hate that there's no making some people happy.
Well, to be fair, there is the tail issue. Virtually all pre-4E half-dragons, draconians, and similar hybrids have tails. 4E, for reasons that are a mystery to me, decided dragonborn should be tail-less (but tieflings get long ugly flesh-colored things sticking out of their butts).
Me, I think tail-less dragonborn look silly, so I'm happy to pick over the old dragonoids. But I could see how someone more invested in the 4E version would find them unsatisfactory.
Got to agree with you on the fomorians though. 4E fomorians look quite remarkably like what I remember from the 2E Monstrous Compendium.