One thing I thought of a few years ago but never needed to do (I have kids, and they manage to Hoover my FSA money out by late summer usually -- I'm conservative in my deferral) - is to go buy a bunch of pain meds (Tylenol, Advil, etc.), vitamins, band-aids, etc., then submit for FSA reimbursement on those items. Then, if I ended up not needing that stuff, I could always return it to the store after the first of the year. Perhaps this is somewhat of a gray area ethically, but I'll leave that up to you.
IIRC OTC medical stuff is now either not FSA eligible, or there was talk about that, so I'd check into that before trying this idea.