Hey Teddy
I too am always looking for new vocal sounds (especially ther garage variety), I use an old layfayette mic from the 60s on a lot of stuff (it is super low fi but not real warm, similar to some of the harp mics discussed here), I also add distortion , reverb and other effects when recording, which work real well. A few options, run a mic through a little tube amp and you can tweak the gain, reverb etc, or try a cheap mic pr like the one ART sells (30 bucks) see it here> ART Tube Pre . I just bought one and will be experimenting with it this week, I will let you know what I come up with (if you care ;-) ).
Peace,
Chaz