While I agree that the movie itself does not lend too much in the slash department, I more or less fell into the fandom due to good writers I knew from other fandoms and from whom I would read pretty much anything so... yeah. But if you want a fic rec, I can only come up with one which, for me, is my personal canon for Arthur and Eames. As someone already said, there is no prior history for the characters except what Nolan told the press (i.e. Arthur and Eames both having military backgrounds) and this fic is pretty much running with that, weaving in a lot of the movie which makes it better. Just... if you want to give it a shot, this is the fic to try:

The Music Makers by mami_san (more or less gen with a lot of action and violence and some Arthur/Eames slash near the end) - it is finished with about 50.000 words.