There were no (substantial) mods for ME1. The only modding for a ME game that would really be feasible are uber guns and armor and such. The ME games are so dialogue heavy that I'm not sure I'd want any large new mods. New planets and missions voice acted by the modders and their buddies are not high on my to-play list.
So now you see that evil will always triumph because good is dumb. - Dark Helmet