Come on, people haven't seen Spartans as... Spartans for a long time; it's become synonymous with hoplites.

So, don't expect an army of Greeks from me. I do have an agreement to use models from Greek mods in Mount & Blade, but I don't see a good base for these units. Well, you could paint an elven archer to look like he's wearing a toga, but there are no good candidates for infantry and mages, and a slinger would look better than an archer.

I agree that the faction should be good, but, in principle, villains could also work well. Just make the pegasi black, and it would look great! Hoplites in bronze with black cloaks...

But if I'm going to change a faction within my mod, I'm for replacing the Forest faction – satyrs and minotaurs would fit well in the forest. In principle, the presence of archers can be justified by saying that they are elves, but we'll have to give up on druids – that's a Celtic thing. The Greeks have oracles, which would then also influence the dark elves.

Added 3 minutes later
But all of this could change 10 times.