Shawn Garbett has written GEM — the Generic Easy Miniatures Rules — which seem to be aimed at larget miniatures in a skirmish scenario. Garbett writes:
GEM is specifically for those who are sick of having new revisions of their favorite rule system leave out those great new miniatures they just finished painting. If all the commercial miniature systems have flaws which you really don’t like, then GEM may be just what you’ve been looking for. If you’ve ever been bogged down in rolling and rolling with no resolution in sight, GEM is probably for you. Several other play options exist, for customization to a gaming groups own tastes.