The first band I think of that succesfully did accoustic songs & instrumentals is In Flames...
accoustic medley, man made god, wayfaerer, timeless, everlost part II, hell even Hårgalåten is pretty cool with the violins... umm, Jester's Dance too....
but ANYWAY! my point isn't that Kalmah should be able to do what another band has done, but that it really gives the listeners a better perspective of what a band can do.. you say it's not Kalmah's style.. well who knows other than them and people who know them personally? They are artists and I'd love to here them experiment and really expand, along with every other band out there, but sadly it doesn't happen as much as i'd like it to..