I was wondering if anyone knew of an online LoA community where people have posted their own Legends they've made. I think that would be very fun to do. Does one even exist for this game yet?

Have you looked on boardgamegeek.com? There are a few on there...

I submitted an English translation of an Epic scenario in:

http://boardgamegeek.com/filepage/98769/fan-legend-saruman-english

And I'm currently translating a couple of more scenarios to English. Will update once I'm done.