I'm trying the black/grey/white/contrast technique out on some 1/72 goblins from Dark Alliance. My idea with these is that they'll form warbands of large creatures ("Swamp trolls"? "Grendel-kin"?) in 15mm HotT (on 28mm bases) and hordes in 28mm HotT.
I'll either double up the warband bases to make old-fashioned 60mm deep hordes, or just use the individual 30mm-deep elements. I don't think the missing 10mm (28mm hordes are generally now based 40mm deep) will make any real difference, as warbands and knights destroy hordes, and behemoths and beasts will catch them in pursuit in any case.
Anyway, 1/72 figures are quite hard to paint well because of the soft detail and stubborn mould lines. So I just want an acceptable "mass effect" that will allow me to rip through loads of them very quickly. I think they'll go six to a base, so the box of 48 should yield eight elements. Those, coupled with two trolls like the one above, will form a full 24 AP army.
Here's the test figure. He's not great, but he took no time at all, and I think a big mass of these will look OK when based up together.