get an even more obnoxious and even more flashy DBZ loop or simalar anime to distract you from the sizure fans... lol.
I gues you could sell it to a stoner as crappy strobe lights, but as to fixing them, i have no idea.
is it on a fan controller? if so the voltages may be messing with the propper function of the LED, if you can change where they get thier power or change the fan controller settings (if applicable).
I think that if you can rule out a problem with funny power and such, you should ebay some seizure fans, and go buy replacements with the sale's profits somewhere, imo.