I originally used this as a guide:
http://blog.cakewalk.com/quadcurve-eq-demystified/ I use different curves based on the material, now prominent the item needs to be in the mix, etc. I may clone the same part two or three times, then use the different curves muting/unmuting between the interactions with different tracks. Personally, I really love the eq and the way it functions.
I think a bevy of presets would be awesome. When feeling experimental, I'll flip through presets to give me ideas that I may not have come up with myself.