My current goal on our small server is to provide power to everyone on the server using only fuel from a single mob farm. So far, our early game is currently being powered by a dark room+mfr grinder and a couple of reactant dynamo. As our needs increase, we will upgrade the room to cursed earth. Then, I'll run to the nether for a blaze spawner. Last but not least, I'm off to the Twilight Forest for a carminite (ghast) spawner.
Ghast tears and all that essence will power a battery of augmented reactant dynamo at the main base, while blaze rods will be shipped to satellite bases for generator fuel. I'm considering building a few RC boilers and a BR turbine when we get the materials, adding more blaze spawners as needed.
I hear EnderIO can generate power from all this flesh, too. I've not played with the mod since 1.6.4 Monster, so I'm looking forward to delving into the new stuff.
Moral of the story: think of an outlandish concept, then beat the modpack over the head until it does what you want it to. Steal its milk money. Make it eat dirt. Use as many of its parts as you can against it.
@rhn is a builder. I like to break things.