Hmm.. try finding some drum'n'bass/jungle samples/drumloops, then start playing with delays* to get that repeating "machine-gun" effect.
Record several passes with different delay times/repeats/whatever and start chopping up the result. Also try using verbs on just some parts or single hits and add those in. Use reverse. Go nuts with panning and other automation. So much can be done with "just" the regular plugs that come with your DAW.
*Works really cool if you have a delay that allows real-time manipulation of delay times.