I once played with Minechem, it has an exploit where you can use a particular two block flower and grow it using bonemeal and then use the grown flower to decompose it and make more bonemeal from the compounds. And you get some extra stuff leftover (hydro-carbons that can be used as fuel for example), plus you get more bonemeal so that you can even use that to grow other two block flowers that do not produce stuff for bonemeal but produce other compounds and elements, like copper or cobalt if I remember correctly (maybe even others I dont remember). It was really OP and not so hard to setup.
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