I dont know what sort of basses your after but heres a couple i made earlier today.
Its just a few pretty dirty reece basses that i was messing around with
http://www.mediafire.com/?nlnfwzc3dkw0xjm
ahh cool, I gets ya.
My suggestion would be to start off with a nice solid reece, lowpassed, then just play around with some notes and see where that takes ya.
and an 808, take an 808, overdrive it, layer, detune, lowpass and get the transient up. thats a fairly normal sound in liquid, is it not? when you overdrive a sine you get squares apparently. so maybe start with making a reece from squares instead of saws? could be cool, maybe.
This one should be an octave up me reckonslayer one of them 4 or 7 semitones apart. gives you that liquidy sound.
this ^^
i wouldnt use a 808 anymore. just take a sine and pitchenvelope it if you want that sound. 808 sounds dated imo.