I recommend this for anyone interested in learning to customize the default instruments in LMMS! Look through all the samples and see how I customized them. Save the presets that you like.
Here's a nice bad guy theme. I was originally trying to make this into a rap theme, but it evolved very quickly into this other thing, which I like much better. That guitar you're hearing is the Trash Guitar 1 in the ZynAddSubFX pack, slightly tweaked and amped. Nice sound!
Made in LMMS w/default samples (a lot of them customized like crazy), and drum samples from the Quasimoto and 9th Wonder sound kits. Download them for free and put them in your sample folder to hear the beat in LMMS. Probably my best-mastered track to date. I need to find a better compressor, though; the LADSPA compressors aren't very good.