You can always get personalized M&Ms - they make they make a maroon color, as well as a couple of different blues.
You can get things printed on them, such as the pledge class name and bid day date, or just PHI MU. It can get a bit pricey, but if you order 4 bags (minimum order is four, I think), you can put them in cute little baggies.
Just a thought...
www.mymms.com (the link is really working hard to load, so my memory on these is a tad sketchy)