Why not use them for a whole load of games? If they're based for Warhammer on 20mm squares, that'll work for Dragon Rampant and most other "large skirmish"games, including, I think, Saga. But it also gives you a HOTT 60mm frontage for three, so you could attach them (magnets or blue tack) to unobtrusive templates as need be. Or multi-base enough of them to use for HOTT and keep the rest individually based, and then use them together for DR and the like.
One more suggestion: Of Gods and Mortals. Use the treeman and/or champions/heroes as forest god and "legends". Then add a few units of "mortals". It's a cracking game, and you could have a lot of fun coming up with Celtic or Teutonic-inflected profiles for the elves.