The Ringworld map is great, playing it just now. Very different from all the other maps, since one can only expand horizontally. I like it.
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Great indebtedness does not make men grateful, but vengeful; and if a little charity is not forgotten, it turns into a gnawing worm.
There is some kind of fan based LotR-mod project going on. There was two links to LotR maps IIRC in a thread regarding this matter. It is a rather ambitious project with plans on entirely new nations. As our modding tools are not yet available (patch is soon released) it will probably take a while before the scenario is ready.
The maps might be though. Search the forum for LotR and you should find two nice maps (not converted though).
For copyright reasons illwinter will not make LotR maps, but we gladly post player contributed maps and scenarios.